Learn Dutch: Voor elke vierkante meter extra is betere isolatie nodig. - For every extra square meter, better insulation is needed.

This sentence expresses the exact same type of proportional relationship, just with a different structure! It literally says 'for every extra square meter, better insulation is needed'. If you wanted to rewrite this idea using the lesson's grammar, it would look something like: Hoe meer vierkante meters je hebt, des te betere isolatie er nodig is. (The more square meters you have, the better insulation is needed).

Why is extra placed after vierkante meter instead of before it?

In English, we normally say 'extra square meter', and you can technically say extra vierkante meter in Dutch too. However, placing extra right after the noun is a very common Dutch pattern. It emphasizes the 'additional' aspect, making it function almost like saying 'every square meter on top of that'.

Why does the verb is come before the subject betere isolatie?

This happens because of the Dutch 'verb-second' rule. The sentence starts with a long prepositional phrase: Voor elke vierkante meter extra. Since that entire phrase occupies the first position, the verb is must take the second position. This forces the subject (betere isolatie) to move after the verb.

Why does the comparative adjective beter have an -e at the end here?