Question

Which ratios form a proportion:

9/45 & 8/40 or

8/12 & 12/21 or

8/12 & 12/15 or

9/22 & 14/28.

Answer 1

I hope this helps you

Answer 2

`(9)/(45)=(8)/(40)`

Explanation:

A proportion can be defined as the equality of two ratios. That means we have to find which option is showing equivalent ratios, or equivalent fractions. Let's examine each of them

`(9)/(45)=(8)/(40)\\(1)/(5)=(1)/(5)`

As you can observe, the first choice represent equivalent raitos, so it must be part of the answer.

`(8)/(12)= (12)/(21) \\(2)/(3)= (4)/(7)`

This choice doesn't represent a proportion.

`(8)/(12)= (12)/(15) \\(2)/(3)= (4)/(5)`

The third choice doesn't represent a proportion.

`(9)/(22)= (14)/(28)`

The fourth choice doesn't represent a proportion neither.

Therefore, the right answer is the first option.

`(9)/(45)=(8)/(40)`