The masses of an electron, a proton and a neutron respectively will be in the ratio

We know that the mass of electron is $9.109\times {10}^{-31}$ whereas the mass of proton is $1.672\times {10}^{-27}$ and the mass of neutron is $1.674\times {10}^{-27}$

Thus, taking the ratio of the masses of electron, proton and neutron

$\Rightarrow \mathrm{e}:\mathrm{p}:\mathrm{n}$

$\Rightarrow 9.109\times {10}^{-31} \mathrm{kg} : 1.672\times {10}^{-27} \mathrm{kg} : 1.674\times {10}^{-27} \mathrm{kg}$

$\Rightarrow 1: 1836.15: 1838.68$