Question

Which is not a proportion???​

Answer 1

C

Explanation:

By definition a proportion should be equal to each other and can be multiplied by the same number on the numerator and the denominator to make the second fraction.

`(x_1)/(y_1)=(x_2)/(y_2)`

`(x_1)/(y_1)*(z)/(z)=(x_2)/(y_2)`

A

`(3)/(7)*(3)/(3)=(9)/(21)`

So it is a proportion.

B

`(24)/(56)/(8)/(8)=(3)/(7)`

So it is a proportion.

C

`(3)/(7)*(3)/(4)=(9)/(28)`

So it is not a proportion.

D

`(3)/(7)*(4)/(4)=(12)/(28)`

Answer 2

The answer is C. C is not a proportion.

Hope this helps!