In an equilibrium reaction, the rate constants of the forward and backward reactions are $3.2\times {10}^{-4}{\mathrm{mol}}^{-1}{\mathrm{dm}}^3{\mathrm{s}}^{-1}$ and $1.2\times {10}^{-5}{\mathrm{mol}}^{-1}{\mathrm{dm}}^3{\mathrm{s}}^{-1}$, respectively. The equilibrium constant of the reaction is