Two quantities are proportionally related if the ratio between them is constant
[tex]\begin{gathered} \frac{price}{time}=\frac{90}{\frac{3}{4}}=90\cdot\frac{4}{3}=120 \\ \frac{price}{time}=\frac{130}{\frac{3}{2}}=130\cdot\frac{2}{3}=\frac{260}{3}=86\frac{2}{3} \\ \frac{price}{time}=\frac{180}{2}=90 \end{gathered}[/tex]Given that the results are different between them, then the two quantities are not proportionally related
