In proportion, the product of two outer terms is (1/2), one of which is 4, and what is the other inner term.
在比例中，两个外项的积是(1/2)，其中的一个内项是4，另一个内项是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 4</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>