In the ratio, the two outer terms are reciprocals of each other, one inner term is 1.5, and the other inner term is what.
在比例中，两个外项互为倒数，一个内项是1.5，另一个内项是多少．
<gadget id="calculator">1 / 1.5</gadget>
<output>0.666667</output>

<result>0.666667</result>