Home / 81.28-126.09

Finding the Third Proportional to 81.28 and 126.09

Calculator

Solution

The third proportional to 81.28 and 126.09 is: 195.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.28 : 126.09 = 126.09 : x
  2. Step 2: Convert to fraction form
    81.28/126.09 = 126.09/x
  3. Step 3: Cross multiply
    81.28x = 126.09 × 126.09
  4. Step 4: Simplify right side
    81.28x = 15,899.63
  5. Step 5: Solve for x
    x = 15,899.63/81.28
  6. Step 6: Final answer
    x = 195.61

Related Problems

Find third proportional to 40.64 and 63.05
Half scale
Find third proportional to 162.56 and 252.19
Double scale
Find third proportional to 83 and 129
Similar ratio
Find third proportional to 121.92 and 189.14
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.