Convert the ratio to fraction form.
[tex] \large{{\tt{ \frac{3}{4} = \frac{9}{n} }}}[/tex]
Multiply the means and extremes.
[tex] \large{{\tt{ 3 \times \: n = 3n }}}[/tex]
[tex] \large{{\tt{ 4 \times 9 = 36 }}}[/tex]
Divide both 3n and 36 by 3.
[tex] \large{{ \tt{ \frac{ \cancel3n}{ \cancel3} = \frac{36}{3} }}}[/tex]
[tex] \large{{ \tt{ \green{n = 12 }}}}[/tex]
