Question 135253
{{{61/57=x/42}}}  Since 61 and 57 are both in inches and we can express the height of the tree in the same units, feet, as the shadow of the tree, we don't have to worry about conversion of units.


{{{61/57=x/42}}} 


{{{x=(61*42)/57}}}


The calculator says 44.9 and a bunch more decimal digits, but since your LEAST precise measurement is the length of the tree shadow and that is to the nearest foot, you should express your answer to no greater precision.  Therefore the answer is 45 feet.