The ratio of 3 and 8 is equal to the inverse ratio of x and 72, find x.
3和8的比等于x和72的反比，求x．
<gadget id="calculator">8 * 72</gadget>
<output>576</output>

<gadget id="calculator">576 / 3</gadget>
<output>192</output>

<result>192</result>