Some fractions are divided by 4 (1/6) and 4 (4/9), and the quotients are all natural numbers. What is the largest such fraction?
一些分数分别除4(1/6)和4(4/9)，商都是自然数，这样的分数最大是多少．
<gadget id="calculator">5 / 18</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>