In a ratio, the product of two outer terms is the reciprocal of each other, one inner term is 1.4, and the other inner term is 1.4.
在一个比例里两个外项的积互为倒数，一个内项是1.4，另一个内项是多少．
<gadget id="calculator">1 / 1.4</gadget>
<output>0.714286</output>

<result>0.714286</result>