In a ratio, the two inner terms are reciprocals of each other, one of the outer terms (3/8), and the other outer term.
在一个比例中，两个内项互为倒数，其中一个外项(3/8)，另一个外项是多少．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / (3/8)</gadget>
<output>8/3 = around 2.666667</output>

<result>8/3 = around 2.666667</result>