I know that if I have two compounds in equilibrium and I know $\mathrm{\Delta G}$, then I can use $$\mathrm{\Delta G=-RTlnK}$$ to determine the concentrations of the two components at equilibrium. I have 4 compounds that are all in equilibrium with one another \begin{aligned} \mathrm{\Delta G(1,4)} ~&= ~~~3.41~ \mathrm{kcal/mol}\\ \mathrm{\Delta G(3,1)}~&=-2.21~ \mathrm{kcal/mol}\\ \mathrm{\Delta G(2,3)}~&=-0.46~ \mathrm{kcal/mol}\\ \end{aligned}
I applied the equation sequentially and found that \begin{aligned}% [1]~&=~0.34\%\\ [2]~&=~29.1\%\\ [3]~&=~13.5\%\\ [4]~&=~57\%\\ \end{aligned}
Are those the correct concentrations? Is there an "easy" way to do it?