The length of the shadow of a tree of height 3.9 m is 9.1 m. At the same time, the length of the shadow ( in meter ) of a building 46.2 m high 

107.8

The given ratio of height and length:

⇒ Tree : Shadow = 3.9 : 9.1 = 3 : 7

*At the same time the above ratio remains same*

Therefore, ratio of height and length:

⇒ Building : Shadow = 3 : 7

Here,

⇒ 3R = 46.2

⇒ Length of shadow = 7R = \(\frac{46.2}{3}\) × 7 = 107.8 m