Question

Which two ratios form a proportion? A) 1 : 3 and 6 : 3 B) 1 : 3 and 3 : 6 C) 3 : 1 and 9 : 3 D) 3 : 1 and 3 : 9

Answer 1

c

Explanation:

you have to set them up as a fraction and see if they are an equivalent fraction and if they are thats the proportion

Answer 2

C is the answer

3 :1 and 9 :3

Explanation:

a :b :: c:d =
`(a)/(b)` =
`(c)/(d)`

3 :1 and 9 :3

=
`(3)/(1)` and
`(9)/(3)`

3:1 :: 9:3 =
`(3)/(1)` =
`(9)/(3)`

3 = 3 so these two ratios are proportional

or another method is find the cross multiplication

`(3)/(1) = (9)/(3)`

i.e 3 × 3 = 9 × 1

9 =9

so these two ratios are proportional