The latter term of the ratio is (4/15), the ratio is (4/3), what is the former term of the ratio.
比的后项是(4/15)，比值是(4/3)，比的前项是多少．
<gadget id="calculator">4 / 15</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/15) * (4/3)</gadget>
<output>16/45 = around 0.355556</output>

<result>16/45 = around 0.355556</result>