Solve for k
k=\frac{Fr^{2}}{7172}
r\neq 0
Solve for F
F=\frac{7172k}{r^{2}}
r\neq 0
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Fr^{2}=k\times 7172
Multiply both sides of the equation by r^{2}.
k\times 7172=Fr^{2}
Swap sides so that all variable terms are on the left hand side.
7172k=Fr^{2}
The equation is in standard form.
\frac{7172k}{7172}=\frac{Fr^{2}}{7172}
Divide both sides by 7172.
k=\frac{Fr^{2}}{7172}
Dividing by 7172 undoes the multiplication by 7172.
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