Which ratio is not proportionate to 15/45 ?
3/9
3/15
1/3
30/90

15/45 simplify is 1/3.
3/9 _ is 1/3
3/15 _ is 1/5
1/3 is 1/3
30/60 is 1/2
So 3/15 and 30/60 are the correct answers

Hey there, Lets solve this step by step. 

Question = Which ratio is NOT proportionate to 15/45 ? 

A proportion is an equation written in the form stating that two ratios are equivalent. 

15/45 ⊄ 3/15 

Cross multiply:
15 * 15 = 45 * 3 

Simplifying
15 * 15 = 45 * 3 

Multiply 15 * 15
225 = 45 * 3
 
Multiply 45 * 3
225 = 135
 
Solving 225 = 135

The left and right sides are not equal, therefore there is no solution.