\frac { 3 } { 8 } = \frac { z } { 12,8 }
Solve for z
z=4,8
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\frac{3}{8}\times 12,8=z
Multiply both sides by 12,8.
\frac{3}{8}\times \frac{64}{5}=z
Convert decimal number 12,8 to fraction \frac{128}{10}. Reduce the fraction \frac{128}{10} to lowest terms by extracting and canceling out 2.
\frac{3\times 64}{8\times 5}=z
Multiply \frac{3}{8} times \frac{64}{5} by multiplying numerator times numerator and denominator times denominator.
\frac{192}{40}=z
Do the multiplications in the fraction \frac{3\times 64}{8\times 5}.
\frac{24}{5}=z
Reduce the fraction \frac{192}{40} to lowest terms by extracting and canceling out 8.
z=\frac{24}{5}
Swap sides so that all variable terms are on the left hand side.
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