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
2 answers:
Answer:
C is the answer
3 :1 and 9 :3
Step-by-step explanation:
a :b :: c:d =
= 
3 :1 and 9 :3
=
and 
3:1 :: 9:3 =
= 
3 = 3 so these two ratios are proportional
or another method is find the cross multiplication

i.e 3 × 3 = 9 × 1
9 =9
so these two ratios are proportional
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
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I hope this helps!!!!!!