What is the fourth proportional term of 2, 4, 3?
2、4、3的第四比例项是多少．
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / (1/2)</gadget>
<output>6</output>

<result>6</result>