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Finding the Third Proportional to 81,724 and 128,418

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Solution

The third proportional to 81,724 and 128,418 is: 201,791.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,724 : 128,418 = 128,418 : x
  2. Step 2: Convert to fraction form
    81,724/128,418 = 128,418/x
  3. Step 3: Cross multiply
    81,724x = 128,418 × 128,418
  4. Step 4: Simplify right side
    81,724x = 16,491,182,724
  5. Step 5: Solve for x
    x = 16,491,182,724/81,724
  6. Step 6: Final answer
    x = 201,791.18

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.