Gaya Gravitasi

\begin{equation*}
\begin{split}
\frac {F}{F'} & = \frac {G \: \dfrac {m \:.\: 4m}{(3R)^2}}{G \: \dfrac {2m \:.\: 6m}{(2R)^2}} \\\\
\frac {F}{F'} & = \frac {\cancel {G} \: \dfrac {4m^2}{9R^2}}{\cancel {G} \: \dfrac {12m^2}{4R^2}} \\\\
\frac {F}{F'} & = \dfrac {4 \cancel {m^2}}{9 \cancel {R^2}} \:.\: \dfrac {4 \cancel {R^2}}{12 \cancel {m^2}} \\\\
\frac {F}{F'} & = \frac {4 \:.\: 4}{9 \:.\: 12}  \\\\
\frac {F}{F'} & = \frac {4}{27} \\\\
4 F' & = 27 F \\\\
F' & = \frac {27}{4} F
\end{split}
\end{equation*}