(3/7) of a number is (7/10), what is the formula for finding this number
一个数的(3/7)是(7/10)，求这个数的算式是多少
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(7/10) / (3/7)</gadget>
<output>49/30 = around 1.633333</output>

<result>49/30 = around 1.633333</result>