4.5: x=5(1/3):(2/9).
4.5：x=5(1/3)：(2/9)．
<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">3 / 16</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">(2/9) * 4.5 * (3/16)</gadget>
<output>0.1875</output>

<gadget id="calculator">16 / 3</gadget>
<output>16/3 = around 5.333333</output>

<gadget id="calculator">(16/3) * (3/16)</gadget>
<output>1</output>

<gadget id="calculator">0.1875 / 1</gadget>
<output>0.1875</output>

<result>0.1875</result>