Question

Which of the following ratios form a proportion:

$3:11$ and $7:15$

Answer 1

Four numbers $a,b,c,d$ are said to be in proportion if $a:b$ and $c:d$ are equivalent ratios.

Now, taking ratios from the question.

As we clearly see $3:11\ne 7:15$.

Hence, the ratios did not form a proportion.