Solve 3.9/90=6.4/x

$$\frac { 3.9 } { 90 } = \frac { 6.4 } { x }$$

Solve for x

$$x = \frac{1920}{13} = 147\frac{9}{13} \approx 147.692307692$$

Steps for Solving Linear Equation

Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 90x, the least common multiple of 90,x.

$$x\times 3.9=90\times 6.4$$

Multiply 90 and 6.4 to get 576.

$$x\times 3.9=576$$

Divide both sides by 3.9.

$$x=\frac{576}{3.9}$$

Expand \frac{576}{3.9} by multiplying both numerator and the denominator by 10.

$$x=\frac{5760}{39}$$

Reduce the fraction \frac{5760}{39} to lowest terms by extracting and canceling out 3.

$$x=\frac{1920}{13}$$