I have a simple question on ratios and proportions...can someone help?

Question

amistre64 · Answer

can try :)

anonymous · Answer

it is here http://www.math.com/school/subject1/lessons/S1U2L2DP.html

anonymous · Answer

I am having trouble with step 3

amistre64 · Answer

20/25 = 4/5   is that your question?

anonymous · Answer

No Farther down...It says step 3

amistre64 · Answer

itd be simpler if you just typed a question :)

anonymous · Answer

In a horror movie featuring a giant beetle, the beetle appeared to be 50 feet long. However, a model was used for the beetle that was really only 20 inches long. A 30-inch tall model building was also used in the movie. How tall did the building seem in the movie?

anonymous · Answer

it says the answer is 75...I keep coming up with 600

anonymous · Answer

When it goes through the steps to solve it seems to be step 3 where I lose it

amistre64 · Answer

20 is to 50  as 30 is to what number...

lets write this like fractions:

20     30
--  =  --
50       x

What do you get from here?

anonymous · Answer

20 x X=30x50

amistre64 · Answer

good,

20x = 1500

now how do we solve for x?

anonymous · Answer

divide both sides by 20

amistre64 · Answer

very good, you are a pro at this :)

that gives us:

x = 1500/20

Which is?

anonymous · Answer

75

amistre64 · Answer

TADA!!!   excelent job :)

anonymous · Answer

Thanks I was getting hung up on the inches and feet part of it

amistre64 · Answer

You did great; keep up the good work :)