Question

Is 3:7 equal to 15:45

Answer 1

no. its is not. the closest it gets is 14.8.

Answer 2

No, these are not equal, here's why:
3 * 5 = 15
7 * 5 = 35
7 * 5 ≠ 45

Another good way to look at it is in fraction form:

3/7 is simplified
15/54 = 1/3
1/3 ≠ 3/7

So, in conclusion, these are not complementary ratios

Hope this helps.