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Finding the Third Proportional to 128,909 and 276,860

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Solution

The third proportional to 128,909 and 276,860 is: 594,616.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909 : 276,860 = 276,860 : x
  2. Step 2: Convert to fraction form
    128,909/276,860 = 276,860/x
  3. Step 3: Cross multiply
    128,909x = 276,860 × 276,860
  4. Step 4: Simplify right side
    128,909x = 76,651,459,600
  5. Step 5: Solve for x
    x = 76,651,459,600/128,909
  6. Step 6: Final answer
    x = 594,616.82

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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.