A spherical drop of liquid splits into 1000 identical spherical drops. If u$_\mathrm{i}$ is the surface energy of the original drop and u$_\mathrm{f}$ is the total surface energy of the resulting drops, the (ignoring evaporation), ${{{u_f}} \over {{u_i}}} = \left( {{{10} \over x}} \right)$. Then value of x is ____________ :