The ratio of the relative strengths of weak nuclear force and gravitational force is
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While exact values depend on the separation distance and particles involved (protons/electrons), the standard orders of magnitude usually taught are:
Strong ($1$) : EM ($10^{-2}$) : Weak ($10^{-13}$) : Gravity ($10^{-39}$).
Remembering this sequence helps solve such ratio problems quickly.