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.
[tex]\frac{x_1}{y_1}=\frac{x_2}{y_2}[/tex]
[tex]\frac{x_1}{y_1}*\frac{z}{z}=\frac{x_2}{y_2}[/tex]
A
[tex]\frac{3}{7}*\frac{3}{3}=\frac{9}{21}[/tex]
So it is a proportion.
B
[tex]\frac{24}{56}/\frac{8}{8}=\frac{3}{7}[/tex]
So it is a proportion.
C
[tex]\frac{3}{7}*\frac{3}{4}=\frac{9}{28}[/tex]
So it is not a proportion.
D
[tex]\frac{3}{7}*\frac{4}{4}=\frac{12}{28}[/tex]
