If the eccentricity of the two ellipse $\frac{{{x}^{2}}}{169}+\frac{{{y}^{2}}}{25}=1$ and $\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1$ are equal, then the value of $a/b$ is