Question

Determine if the following numbers are in proportion:

15, 45, 40, 120

Answer 1

If two ratios are equal, we say that they are in proportion.

Ratio of 15 to 45 = $\frac{15}{45}$ = 1 : 3

Ratio of 40 to 120 = $\frac{40}{120}$ = 1 : 3

Since the simplest form of the ratios 15 : 45 and 40 : 120 are equal ,15, 45, 40, 120 are in proportion