GIVING BRAINLIEST! Thomas decides to use the method of proportions and similar triangles to find the height of a lamppost. He measures the length of the post's shadow and finds it is 5 feet long. Then, he holds a 1-foot ruler perpendicular to the ground and finds that it casts a 2-inch shadow. How tall is the lamppost? a. 2.5 ft c. 30 ft b. 12 ft d. 60 ft Consider these proportions: 1:3 1.5:4.5 2:6 2.5:7.5 Which of the following proportions belongs to the above set?