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Finding the Third Proportional to 84.25 and 125.81

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Solution

The third proportional to 84.25 and 125.81 is: 187.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.25 : 125.81 = 125.81 : x
  2. Step 2: Convert to fraction form
    84.25/125.81 = 125.81/x
  3. Step 3: Cross multiply
    84.25x = 125.81 × 125.81
  4. Step 4: Simplify right side
    84.25x = 15,828.79
  5. Step 5: Solve for x
    x = 15,828.79/84.25
  6. Step 6: Final answer
    x = 187.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.