Home / 71.13-77.75

Finding the Third Proportional to 71.13 and 77.75

Calculator

Solution

The third proportional to 71.13 and 77.75 is: 84.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.13 : 77.75 = 77.75 : x
  2. Step 2: Convert to fraction form
    71.13/77.75 = 77.75/x
  3. Step 3: Cross multiply
    71.13x = 77.75 × 77.75
  4. Step 4: Simplify right side
    71.13x = 6,045.06
  5. Step 5: Solve for x
    x = 6,045.06/71.13
  6. Step 6: Final answer
    x = 84.99

Related Problems

Find third proportional to 35.56 and 38.88
Half scale
Find third proportional to 142.25 and 155.50
Double scale
Find third proportional to 73 and 80
Similar ratio
Find third proportional to 106.69 and 116.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.