When the ratio of two parts of an object is approximately 0.618:1, it will give people a beautiful visual experience. 0.618:1 is what we often call the golden ratio. Now a construction team is building a rectangular lawn. It is known that the width of this rectangular lawn is 247.2 meters. If the ratio of the width to the length of this lawn conforms to the golden ratio, how many meters should the length of this lawn be?
当一个物体的两个部分的比大致符合0.618：1时，就会给人以一种优美的视觉感受，0.618：1就是我们常说的黄金比例，现在有一家施工队在建造一块长方形草坪，已知这块长方形草坪的宽为247.2米，要使这块草坪的宽和长之比符合黄金比例，则这块草坪的长应为多少米．
<gadget id="calculator">247.2 / 0.618</gadget>
<output>400</output>

<result>400</result>