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Finding the Third Proportional to 129,909 and 279,156

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Solution

The third proportional to 129,909 and 279,156 is: 599,866.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,909 : 279,156 = 279,156 : x
  2. Step 2: Convert to fraction form
    129,909/279,156 = 279,156/x
  3. Step 3: Cross multiply
    129,909x = 279,156 × 279,156
  4. Step 4: Simplify right side
    129,909x = 77,928,072,336
  5. Step 5: Solve for x
    x = 77,928,072,336/129,909
  6. Step 6: Final answer
    x = 599,866.62

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.