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Finding the Third Proportional to 61,432 and 129,420

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Solution

The third proportional to 61,432 and 129,420 is: 272,651.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,432 : 129,420 = 129,420 : x
  2. Step 2: Convert to fraction form
    61,432/129,420 = 129,420/x
  3. Step 3: Cross multiply
    61,432x = 129,420 × 129,420
  4. Step 4: Simplify right side
    61,432x = 16,749,536,400
  5. Step 5: Solve for x
    x = 16,749,536,400/61,432
  6. Step 6: Final answer
    x = 272,651.65

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.