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A light house cast a 128 f shadow a nearby lamp meas. 5f 3in casts a 8f shadow, how can u write a proportion?
I have a geometry question "A light house casts an 128 ft shadow and a nearby lampost that measures 5 ft 3 in casts an 8 ft shadow. Write a proportion that can be used to determine the height of the lighthouse?
Me and my friend have 2 different answers i need to know whats the answer.
Thanks.
let the light house be X
x:128=5.25:8 (3in = 1/4feet)
★128*5.25=8x ( By the Equality of Cross Products)
★672=8x
★672/8=8x/8
★84=x
★the light house = 84feet
☆Equality of Cross Products☆
For any numbers a and c and any nonzero numbers b and d, a/b=c/d if and only if ad=bc
Ex) ★If x/8 = 2/4 , then x:8=2:4
Underneath This Lamp Post Light - The King Blues cover