Home / 638.75-719.75

Finding the Third Proportional to 638.75 and 719.75

Calculator

Solution

The third proportional to 638.75 and 719.75 is: 811.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.75 : 719.75 = 719.75 : x
  2. Step 2: Convert to fraction form
    638.75/719.75 = 719.75/x
  3. Step 3: Cross multiply
    638.75x = 719.75 × 719.75
  4. Step 4: Simplify right side
    638.75x = 518,040.06
  5. Step 5: Solve for x
    x = 518,040.06/638.75
  6. Step 6: Final answer
    x = 811.02

Related Problems

Find third proportional to 319.38 and 359.88
Half scale
Find third proportional to 1,277.50 and 1,439.50
Double scale
Find third proportional to 641 and 722
Similar ratio
Find third proportional to 958.13 and 1,079.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.