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Finding the Third Proportional to 83,405 and 129,339

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Solution

The third proportional to 83,405 and 129,339 is: 200,570.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,405 : 129,339 = 129,339 : x
  2. Step 2: Convert to fraction form
    83,405/129,339 = 129,339/x
  3. Step 3: Cross multiply
    83,405x = 129,339 × 129,339
  4. Step 4: Simplify right side
    83,405x = 16,728,576,921
  5. Step 5: Solve for x
    x = 16,728,576,921/83,405
  6. Step 6: Final answer
    x = 200,570.43

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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.