A rod is clamped at both of its ends and stationary longitudinal waves are produced in it. In first experiment, the rod has a total of 4 nodes with amplitude of each anti-node to be 1mm. In other experiment, the rod has a total of 6 nodes with amplitude of each anti node to be 2mm. The energy of vibrations in the rod in two cases in $E_1 and E_2$ respectively. If the value of $\frac{{\text{E}}_{\text{1}}}{{\text{E}}_{\text{2}}}$ is x/100,The value of  x is _______