In a ratio, the product of its two inner terms is the smallest prime number. It is known that one of its outer terms is (5/7), then what is the other outer term.
在一个比例中，它两个内项相乘的积是最小的质数，已知它的一个外项是(5/7)，那么另一个外项是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">4 / (5/7)</gadget>
<output>28/5 = around 5.6</output>

<result>28/5 = around 5.6</result>