What are proportional relationships?

Answer 1

You have to times each number by there then divide by pi.
when you have multiple groups of multiple numbers that all share a conversion multiple

ex

1 2 4, 2 4 8, 3 6 12,

1 x 2 = 2

2 x 2 = 4

4 x 2 = 8

1 x 3 = 3

2 x 3 = 6

4 x 3 = 12

2 x 1.5 = 3

4 x 1.5 = 6

8 x 1.5 = 12