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I cant remember how to do ratios.. i could use a quick review.. example: find the value of x 0.5:x::10:100 or find the value of x 1/8:7/8::1:x
Hello Michelle,
Ratios can be set-up as equations with fractions.
In general, if a:b::c:d ==> a/b=c/d
Thus, 0.5/x = 10/100...cross-multiplying gives: 10x=50 so x=5
and (1/8)/(7/8) = 1/x...cross-multiplying gives: (1/8)x=7/8
==> x/8 = 7/8, so x=7
OK?
Happy New Year!
Abe
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Answers by Expert:
Abe Mantell
Expertise
Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!
Experience
Over 15 years teaching at the college level.
Organizations belong to
NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.
Education/Credentials
B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook
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