Cross multiply: 20 * b = 45 * 34
Simplifying: 20 * b = 45 * 34
Multiply 45 * 34: 20b = 1530
Solving: 20b = 1530
Solving for variable 'b'.
Move all terms containing b to the left, all other terms to the right.
Divide each side by '20': b = 76.5
Simplifying: b = 76.5