Two planets at mean distance ${d_1}$ and ${d_2}$ from the sun and their frequencies are $n_1$ and $ n_2$ respectively then
$n_1^2d_1^2 = {n_2}d_2^2$
$n_2^2d_2^3 = n_1^2d_1^3$
${n_1}d_1^2 = {n_2}d_2^2$
$n_1^2{d_1} = n_2^2{d_2}$
Two planets at mean distance ${d_1}$ and ${d_2}$ from the sun and their frequencies are $n_1$ and $ n_2$ respectively then
$\frac{{{T^2}}}{{{R^3}}} = \frac{{{T^2}}}{{{d^3}}} = \frac{1}{{{n^2}{d^3}}} = $ constant
$\therefore \,\,\,n_1^2d_1^3 = n_2^2d_2^3$ [where $n =$ frequency]
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