
Fraction Calculator with Variables (or Solve for x Calculator Fractions) is used to calculate the unknown variable to solve the proportion between two fractions. Fraction Calculator with Variables takes two equal fractions with one of the value being unknown as 'x' and calculates the unknown value based on the input fractions. 
Let's look at this equation:$\frac{A}{B}$ = $\frac{C}{D}$
Given the equation $\frac{6}{10}$ = $\frac{x}{18}$, then solve for x.
Here: A = 6, B = 10, C= x and D = 18
So, C = x =$\frac{A \times D}{B}$ = $\frac{6 \times 18}{10}$ = $\frac{108}{10}$ = 10.8
x(unknown value) = 10.8
Given the equation $\frac{4}{8}$ = $\frac{6}{x}$, then solve for x.
Here: A = 4, B = 8, C= 6 and D = x
So, D = x = $\frac{C \times B}{A}$ = $\frac{6 \times 8}{4}$ = $\frac{48}{4}$ = 12
x(unknown value) = 12