Which quantity is proportional to 16⁄4?

4.

This is because 4 goes into 16 4 times, hence 4 x 4 being 16.

Therefore, the answer would be four.

Hope this helps!

It would be 15 m how i got the answer: (20x20) + b^2 = (25x25)400 + b^2 = 625625-400=225square that and get 15hope this : )