ANSWER :
x = 15/8
EXPLANATION :
From the problem, we have the equation :
[tex]\frac{x}{3}=\frac{5}{8}[/tex]Cross multiply :
[tex]\begin{gathered} 8x=5(3) \\ 8x=15 \end{gathered}[/tex]Divide both sides by 8 :
[tex]\begin{gathered} \frac{8x}{8}=\frac{15}{8} \\ \\ x=\frac{15}{8} \end{gathered}[/tex]