There are two ratios, one is 4:7, and the former term of the other ratio is 8 greater than the former term of 4:7. To make these two ratios form a proportion, the latter term of the other ratio is greater than the latter term of 4:7 How many.
有两个比，一个是4：7，另一个比的前项比4：7的前项大8，要使这两个比组成比例，另一个比的后项比4：7的后项大多少．
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">12 * 7</gadget>
<output>84</output>

<gadget id="calculator">84 / 4</gadget>
<output>21</output>

<gadget id="calculator">21 - 7</gadget>
<output>14</output>

<result>14</result>