Solving Proportions through Cross Multiplication

What is the first step in solving a proportion using cross multiplication?

• Divide the numbers on both sides.

• Subtract the smaller number from the larger number.

• Add the numbers on both sides.

• Multiply the numbers diagonally across the equal sign.

In the first example, what is the value of x when 10x equals 210?

• x = 21

• x = 10

• x = 30

• x = 15

How do you solve for x when the equation is 8x = 72?

• Subtract 8 from both sides.

• Divide both sides by 8.

• Add 8 to both sides.

• Multiply both sides by 8.

What is the result of dividing 192 by 12 in the context of solving for x?

• x = 14

• x = 18

• x = 16

• x = 12

In the final example, what is the value of x when 320 is divided by 32?

• x = 8

• x = 9

• x = 11

• x = 10