Two satellites $\mathrm{A}$ and $\mathrm{B}$, having masses in the ratio $4: 3$, are revolving in circular orbits of radii $3 \mathrm{r}$ and $4 \mathrm{r}$ respectively around the earth. The ratio of total mechanical energy of $\mathrm{A}$ to $\mathrm{B}$ is :