4 \cdot 10^{11} \cdot 5^2 = 10^{-11} \cdot r_{12}^2 \\
4 \cdot 10^{11} \cdot r_{23}^2 = 10^{-11} \cdot r_{12}^2 \\
4 \cdot 10^{11} \cdot r_{23}^2 = 10^{-11} \cdot r_{12}^2