Which of the following four numbers cannot be proportional to 1.2, 1.8, 4.8
下列四个数中，不能与1.2，1.8，4.8组成比例的是多少
<gadget id="calculator">20 / 9</gadget>
<output>20/9 = around 2.222222</output>

<result>20/9 = around 2.222222</result>