In the ratio of 3:4=6:8, if 8 is added to the last term of the first ratio, how much is added to the last term of the second ratio, and the formula can still be proportional. What is the answer?
在比例3：4=6：8中，若第一个比的后项加上8，则第二个比的后项加几后式子仍能成比例，答案是多少
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<result>16</result>