I need help in learning how to solve these probs 1/4:x=20:4000?

Question

i just went back to college after 28 yrs and i'm having the hardest time remembering how to do these I need help in learning can someone HELP????

Answer 1

20 divided into 4000 is 200

so 1/4x200 is 50 so the answer is 1/50

Answer 2

Set up a proportion of 1/4 is to x as 20 is to 4000.  (1/4 numerator and x denominator equals 20 numerator and 4000 denominator) Then cross multiply.  This means to multiply 1/4 by 4000 and x by 20. Now 1000 (1/4 times 4000) equals 20x.  Divide both sides by twenty. 50=x

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Basically, just cross multiply and then divide by the number next to the x.

Answer 3

(1/4) / X   = 20 /4000, then 0.25 / X  =1 / 200 = 0.25 / 50,because

nominators are equal,so the denominators are equal too.X=50

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