What is real life application of Basic proportionality theorem?

I guess, the BPT is used in Tiles & Painting and so on...

It can be useful as paintings, tiles & many other things as such require precision & BPT helps to make sure that its in proportional.

The theorem states that when a line is drawn parallel to one side of the triangle (inside it) it divides the other two sides of the same triangle in equal proportions. Similar is the Converse and it proves true.

BPT stands for Basic Proportionality Theorem & was discovered by Thales.

I hope this satisfies your question.