$\begin{array}{r}{\mathrm{Sn}}^{2+}\left(aq\right)+..{{\mathrm{MnO}}_4}^{-}\left(aq\right)+\dots {\mathrm{H}}^{+}\left(aq\right)\\ ⟶{\mathrm{Sn}}^{4+}\left(aq\right)+\dots {\mathrm{Mn}}^{2+}\left(aq\right)+\dots {\mathrm{H}}_2\mathrm{O}\left(l\right)\end{array}$

When this equation for the reaction of ${\mathrm{Sn}}^{2+}\left(aq\right)$ and ${\mathrm{MnO}}_4^{-}\left(aq\right)$ is balanced correctly. what is the ratio, ${\mathrm{Sn}}^{2+}/{\mathrm{MnO}}_4^{-}?$