In the ratio, the product of the two outer terms is 50, one of the inner terms is 4, and what is the other inner term.
在比例中，两个外项的积是50，其中一个内项是4，另一个内项是多少．
<gadget id="calculator">50 / 4</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>