Question

How do you determine whether the two ratios form a proportion: `6/9, 10/15`?

Answer 1

The ratios are equal and form a proportion.

Explanation:

To find out if `6 : 9 = 10: 15`

`6/9 and 10/15" "larr` cross- multiply

`6xx15 = 9xx10`

`90 = 90`

Therefore the ratios are equal and form a proportion.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OR
Change each ratio to its simplest form:

`(6div3)/(9div3) and (10div5)/(15div5)`

`2/3 = 2/3`