At 3:00 p.m. on Sunday, students in the sixth grade extracurricular interest group wanted to measure the actual height of a big tree. They first measured the shadow of the big tree to be 6.8 meters long, and then they put a 2-meter-long bamboo pole vertically on the ground Above, the measured shadow length of the bamboo pole is 0.85 meters, please calculate the actual height of the big tree according to the above data. (Solution by proportional method)
星期天下午3：00，六年级课外兴趣小组的同学要测量一棵大树的实际高度，他们首先测量了大树的影子长6.8米，接着他们把一根2米长的竹杆垂直放在平地上，测得竹杆的影子长度是0.85米，请你根据上面的数据算出大树的实际高度．(用比例方法解)
<gadget id="calculator">6.8 * 2</gadget>
<output>13.6</output>

<gadget id="calculator">13.6 / 0.85</gadget>
<output>16</output>

<result>16</result>