In a ratio, the product of two outer terms is the smallest composite number, one of which is (12/7) and what is the other inner term.
在一个比例里，两个外项的积是最小的合数，其中一个内项为(12/7)，另一个内项为多少．
<gadget id="calculator">12 / 7</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">4 / (12/7)</gadget>
<output>7/3 = around 2.333333</output>

<result>7/3 = around 2.333333</result>