Question

Which is not a proportion???​

Answer 1

Answer:

C

Step-by-step 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.

$\frac{x_1}{y_1}=\frac{x_2}{y_2}$

$\frac{x_1}{y_1}*\frac{z}{z}=\frac{x_2}{y_2}$

A

$\frac{3}{7}*\frac{3}{3}=\frac{9}{21}$

So it is a proportion.

B

$\frac{24}{56}/\frac{8}{8}=\frac{3}{7}$

So it is a proportion.

C

$\frac{3}{7}*\frac{3}{4}=\frac{9}{28}$

So it is not a proportion.

D

$\frac{3}{7}*\frac{4}{4}=\frac{12}{28}$

Answer 2

The answer is C. C is not a proportion.

Hope this helps!