Uwiano huu ni sahihi.

• uwiano = ratio, proportion, balance
• huu = this
• ni = is / are
• sahihi = correct, right, accurate

So the whole sentence means This ratio is correct or This proportion is correct.

In Swahili, demonstratives such as this usually come after the noun, not before it.

So:

• uwiano huu = this ratio
• not huu uwiano

That noun-first order is very common in Swahili:

• mtu huyu = this person
• kitabu hiki = this book
• uwiano huu = this ratio

Swahili nouns belong to different noun classes, and words like this, that, adjectives, and some verbs often have to agree with the noun’s class.

Here, uwiano takes the demonstrative huu, so uwiano huu is the correct matching form for this ratio.

This is one of the big differences from English: in English, this stays the same for many nouns, but in Swahili the form changes depending on the noun class.

Ni is the copula here — the word that means is / are.

So:

• Uwiano huu ni sahihi = This ratio is correct

A useful thing to remember is that ni does not change the way English am / is / are does. It stays ni.

For example:

• Mimi ni mwanafunzi = I am a student
• Yeye ni mwalimu = He/she is a teacher
• Uwiano huu ni sahihi = This ratio is correct

Sahihi means correct, right, or accurate.

In this sentence, it works like an adjective in English: it describes the ratio.

So:

• uwiano huu = this ratio
• ni sahihi = is correct

Together: This ratio is correct.

Not every descriptive word in Swahili shows obvious noun-class agreement in everyday usage. Sahihi is commonly used in a fixed form.

So you will often see it unchanged in phrases like:

• jibu sahihi = correct answer
• majibu sahihi = correct answers
• uwiano sahihi = correct ratio

That is normal. So in Uwiano huu ni sahihi, there is nothing missing: sahihi is fine as it is.

Yes, but it would mean something slightly different.

• Uwiano huu ni sahihi = This ratio is correct
  This is a full sentence.

• Uwiano sahihi = the correct ratio / a correct ratio
  This is just a noun phrase, not a complete sentence by itself.

So if you want to make a full statement, you need ni:

• Uwiano huu ni sahihi

Yes. Sahihi can mean correct, accurate, exact, or right, depending on context.

For example, it can be used for:

• a correct answer
• accurate information
• the right spelling
• an exact value

In Uwiano huu ni sahihi, the most natural translation is usually This ratio is correct or This proportion is correct.

You can say:

Uwiano huu si sahihi.

That means:

This ratio is not correct.

Here, si is the negative form used instead of ni in this kind of sentence.

So compare:

• ni sahihi = is correct
• si sahihi = is not correct

A simple learner-friendly pronunciation guide is:

• uwiano ≈ oo-wee-AH-no
• huu ≈ hoo-oo or a long hoo
• ni ≈ nee
• sahihi ≈ sa-HEE-hee

A few pronunciation tips:

• Swahili vowels are usually pronounced clearly and consistently.
• The stress is usually on the second-to-last syllable.
• Try to pronounce each vowel cleanly rather than reducing it like in English.

So the whole sentence sounds roughly like:

oo-wee-AH-no hoo-oo nee sa-HEE-hee

Yes, it is a natural and correct sentence.

Its structure is straightforward:

• noun + demonstrative → uwiano huu = this ratio
• copula → ni = is
• description → sahihi = correct

So it is a very normal Swahili pattern, and it is a good model for making similar sentences, such as:

• Jibu hili ni sahihi. = This answer is correct.
• Hesabu hii ni sahihi. = This calculation is correct.
• Maelezo haya ni sahihi. = This information is correct.