Which of the following numbers cannot be proportional to (1/2), (2/3), (8/9)
下列各数中，不能与(1/2)、(2/3)、(8/9)组成比例的是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(1/2) * (8/9)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>