Home / 64.50-87.75

Finding the Third Proportional to 64.50 and 87.75

Calculator

Solution

The third proportional to 64.50 and 87.75 is: 119.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.50 : 87.75 = 87.75 : x
  2. Step 2: Convert to fraction form
    64.50/87.75 = 87.75/x
  3. Step 3: Cross multiply
    64.50x = 87.75 × 87.75
  4. Step 4: Simplify right side
    64.50x = 7,700.06
  5. Step 5: Solve for x
    x = 7,700.06/64.50
  6. Step 6: Final answer
    x = 119.38

Related Problems

Find third proportional to 32.25 and 43.88
Half scale
Find third proportional to 129 and 175.50
Double scale
Find third proportional to 67 and 90
Similar ratio
Find third proportional to 96.75 and 131.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.