If the shadow of a tree is 14 m long and the shadow of a person who is 1.8 m tall is 4 m long, how tall is the tree?

Ratio and proportion

real:shadow

so the person is 1.8m but the shadow is 4m

so

real:shadow=1.8:4

so

1.8:4=?:14

1.8/4=?/14

times both sides by 14

25.2/4=?

6.3=?

the tree is 6.3 m tall