Opravdani trošak je odobren za potporu.

Because opravdani is the long/definite form of the adjective opravdan.

In Croatian, many descriptive adjectives can appear in:

• a short form: opravdan
• a long form: opravdani

In modern standard Croatian, the long form is very common when an adjective stands before a noun, especially in formal or administrative language. So opravdani trošak sounds natural in this context.

Both words must also agree with trošak, which is:

• masculine
• singular
• nominative

So the adjective must match that: opravdani.

Trošak is in the nominative singular because it is the subject of the sentence.

A good way to see that is by looking at the whole structure:

• Opravdani trošak = the thing being talked about
• je odobren = has been approved / is approved

So opravdani trošak is the subject, and subjects are normally in the nominative.

Also, trošak is a masculine noun, and its nominative singular form is trošak.

Je odobren is a very common Croatian way to make a passive-style statement.

It consists of:

• je = is / has been from biti
• odobren = a participle/adjectival passive form from odobriti = to approve

So literally it is something like:

• is approved or, depending on context,
• has been approved

In administrative and formal Croatian, this structure is extremely common.

Because trošak is masculine singular, the participle must also be masculine singular:

• odobren

If the noun were feminine, it would change:

• Potpora je odobrena.

Yes, functionally it is passive.

English would often say:

• The eligible/justified cost has been approved for support.

Croatian often expresses this with:

• biti
  • passive participle

So:

• je odobren = has been approved / is approved

The focus is on the cost, not on who approved it. That is why the sentence feels passive.

Here za takes the accusative, so potporu is in the accusative singular.

The base form is:

• potpora = nominative singular

After za, it becomes:

• potporu

So:

• za potporu = for support

This is a very common pattern:

• za posao = for work
• za školu = for school
• za pomoć = for help

In this sentence, za potporu means something like for funding/support purposes.

Literally, yes, potpora means support. But in formal, administrative, or financial contexts, it can often mean:

• aid
• assistance
• funding
• a grant
• subsidy

So in this sentence, potpora probably does not mean emotional support. It more likely refers to some kind of financial support scheme or grant program.

That is why the sentence may sound more natural in English as something like:

• The eligible cost has been approved for funding.

Croatian word order is fairly flexible, but this sentence uses a very normal neutral order:

• Opravdani trošak = subject
• je odobren = predicate
• za potporu = prepositional phrase

So the sentence is structured in a straightforward way.

You could move parts around for emphasis, for example:

• Za potporu je odobren opravdani trošak.
• Odobren je opravdani trošak za potporu.

But the original order sounds natural and neutral, especially in official writing.

Because these are different kinds of forms.

• opravdani is an adjective in the long form
• odobren is a passive participle/adjectival form used with je

Both agree with trošak in gender, number, and case, but they do not have to look identical in their endings.

Here:

• opravdani trošak = masculine singular nominative
• je odobren = masculine singular form agreeing with trošak

So both are matching trošak, just in different grammatical roles.

Grammatically, yes, but in real-world usage it often means something a bit more specific.

In administrative, legal, or funding language, opravdani trošak often means:

• eligible cost
• allowable expense
• approved/justified expense

So while justified cost is close to the literal meaning, the best English translation depends on context. If this comes from a funding or reimbursement document, eligible cost or allowable expense may sound more natural.

No, they are related but not the same.

• trošak = cost, expense
• cijena = price

So:

• trošak is what something costs you, or an expense in accounting
• cijena is the listed or charged price of something

In this sentence, trošak is correct because the context is about an expense/cost being approved.

Yes. Odobren comes from the verb odobriti, which means to approve.

Useful related forms:

• odobriti = to approve
• odobren = approved
• odobrenje = approval

This is worth learning as a word family, because Croatian administrative language often uses these related forms together. For example:

• Zahtjev je odobren. = The request has been approved.
• Potrebno je odobrenje. = Approval is required.