The ratio of a number to (6/7) is equal to the ratio of (1/4) to (3/5), find this number.
一个数与(6/7)的比等于(1/4)与(3/5)的比，求这个数．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(1/4) * (6/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/14) / (3/5)</gadget>
<output>5/14 = around 0.357143</output>

<result>5/14 = around 0.357143</result>