The relative strengths of gravitational, coulomb's and nuclear forces of protons are in the ratio (nearly)

The gravitational force between two protons separated by distance r is given by,

$F_g=\frac{G{m}^2}{r^2}$

The electrostatic force between two protons separated by distance r is given by,

$F_e=\frac{K{q}^2}{r^2}$

substituting the values of charge and mass we get F_g:F_e=1:10³⁶

Nuclear force between two protons is approximately 10³⁸ times of the gravitational force.

⇒F_g:F_e:F_n=1:10³⁶:10³⁸