cheach each option
[tex]\begin{gathered} \frac{4}{x}=\frac{4}{7} \\ \\ \frac{4}{7}=\frac{4}{7} \end{gathered}[/tex]
first option right
[tex]\begin{gathered} \frac{1}{7}=x \\ \\ \frac{1}{7}=\frac{1}{7} \end{gathered}[/tex]
second option wrong
[tex]\begin{gathered} \frac{3}{x}=\frac{7}{3} \\ \\ x=\frac{9}{7} \end{gathered}[/tex]
third option is wrong
[tex]\begin{gathered} \frac{x}{14}=\frac{1}{2} \\ \\ x=\frac{14\times1}{2} \\ \\ x=7 \end{gathered}[/tex]
fourth option is right
[tex]\begin{gathered} \frac{9}{x}=63 \\ \\ x=\frac{9}{63}=\frac{1}{7} \end{gathered}[/tex]
fifth option is wrong
