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.