How do you find the missing value of 2 to 7 = 4 to y

For example since you have to find the y, you will have to the missing number

so since 2:7 is equal to 4:y

it is would be multiply 2 by 2 and then 7 by2

I mean multiply 4

then 4 by 2 is 8 and 7 by 2 is 14

the answer would be 14