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

Answer:

C is the answer

3 :1 and 9 :3

Step-by-step explanation:

a :b :: c:d = $\frac{a}{b}$  =  $\frac{c}{d}$

3 :1 and 9 :3

 = $\frac{3}{1}$ and $\frac{9}{3}$

3:1 :: 9:3 = $\frac{3}{1}$  =  $\frac{9}{3}$

 

    3 =  3 so these two ratios are proportional

or another method is find the cross multiplication

$\frac{3}{1} = \frac{9}{3}$

i.e 3 × 3 = 9 × 1

  9 =9

so these two ratios are proportional

Answer 2

Answer:

c

Step-by-step 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