If the two outer terms of a ratio are 3 and 8, and one of the inner terms is 4, what is the other inner term?
一个比例的两个外项分别是3和8，其中一个内项是4，则另一个内项是多少．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>