Home / 39.38-81.28

Finding the Third Proportional to 39.38 and 81.28

Calculator

Solution

The third proportional to 39.38 and 81.28 is: 167.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.38 : 81.28 = 81.28 : x
  2. Step 2: Convert to fraction form
    39.38/81.28 = 81.28/x
  3. Step 3: Cross multiply
    39.38x = 81.28 × 81.28
  4. Step 4: Simplify right side
    39.38x = 6,606.64
  5. Step 5: Solve for x
    x = 6,606.64/39.38
  6. Step 6: Final answer
    x = 167.79

Related Problems

Find third proportional to 19.69 and 40.64
Half scale
Find third proportional to 78.75 and 162.56
Double scale
Find third proportional to 41 and 85
Similar ratio
Find third proportional to 59.06 and 121.92
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.