The nature team stood the 4-meter-long bamboo pole upright on the ground, and measured its shadow to be 3.8 meters long, and at the same time measured the water tower's shadow to be 17.1 meters long. What is the actual height of the water tower in meters?
自然小组把4米长的竹竿直立在地上，量得它的影子长3.8米，同时量得水塔影子长17.1米．水塔的实际高度是多少米？
<gadget id="calculator">3.8 / 4</gadget>
<output>0.95</output>

<gadget id="calculator">17.1 / 0.95</gadget>
<output>18</output>

<result>18</result>