Question 697739
This can be set up as a proportion, as the proportion of the height of an object to its shadow will be the same for all objects.<br>

6:17 = x:102, where x is the height of the tree. This can also be written as<br>

{{{6/17 = x/102}}}.
{{{102*6 = 17*x}}}
{{{612 = 17*x}}}
{{{612/17 = x = 36}}}<br>

The tree is 36 feet tall.