The ratio of the side lengths of a triangle vegetable field is 4:3:2, and the circumference is 189 meters. What is the length of the longest side in meters?
一块三角形菜地边长的比是4：3：2，周长是189米，其中最长的边长是多少米．
<gadget id="calculator">4 + 3 + 2</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">189 * (4/9)</gadget>
<output>84</output>

<result>84</result>