In order to find the value of x to make the ratios equivalent, we can compare them in their fraction form:
[tex]\frac{21}{x}=\frac{7}{10}[/tex]Now, solving this equation for x, we have:
[tex]\begin{gathered} 7\cdot x=21\cdot10 \\ 7x=210 \\ x=\frac{210}{7} \\ x=30 \end{gathered}[/tex]So the value of x is 30.
