(1/3), 0.05, (5/9) are the first three items of a ratio in turn, find the fourth item of the ratio.
(1/3)，0.05，(5/9)依次是一个比例的前三项，求比例的第四项．
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/9) / (1/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">0.05 * (5/3)</gadget>
<output>0.083333</output>

<result>0.083333</result>