In a ratio, the product of two outer terms is 5, one inner term is 4, and the other inner term is what.
在一个比例中，两个外项的积为5，一个内项是4，另一个内项是多少．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>