If a person standing 5 feet tall casts a shadow 12 feet long, then how long is a tree's shadow if a tree stands 17.5 feet tall?

Answer 1

x=shadow length
12/x=5/12
5/12=0.417
12/x=0.417
12/0.416=28.8ft
check:12/28.8=0.417

28.8ft

Answer 2

the ratio of shadow/height is constant, so

12/5 = x/17.5

or, the height and shadow scale the same way, so since 17.5 is 3.5 times 5, the shadow will be 3.5 times 12 feet long.

Answer 3

got me numbers mixed up, sorry

Answer 4

replace 12 with 17.5