Solving Proportions by Cross-Multiplication #equations #fractions

To quickly solve proportions, we use a mathematical technique known as cross-multiplication. This method is equivalent to multiplying both sides of the equation by a common denominator, which eliminates the fractions and simplifies finding the unknown value.

Q. Solve each proportion for the unknown variable.

a) 3/17 = x/170

b) 100 : y = 6 : 5.5

c) x/(3/5)=4/(1 1/3)

d) (3 1/9)/(4 5/6)=(2 1/3)/y