In a ratio, the product of two outer terms is 1, one inner term is (7/3), what should be the other inner term.
在一个比例中，两个外项的积是1，一个内项是(7/3)，另一个内项应是多少．
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">1 / (7/3)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>