The initial velocity $v_i$ required to project a body vertically upward from the surface of the earth to reach a height of $10R$, where $R$ is the radius of the earth, may be described in terms of escape velocity $v_{\mathrm{e}}$ such that $v_i=\sqrt{\frac{x}{y}}\times v_{\mathrm{e}}$. The value of $x$ will be