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Finding the Third Proportional to 128,866 and 261,356

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Solution

The third proportional to 128,866 and 261,356 is: 530,061.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,866 : 261,356 = 261,356 : x
  2. Step 2: Convert to fraction form
    128,866/261,356 = 261,356/x
  3. Step 3: Cross multiply
    128,866x = 261,356 × 261,356
  4. Step 4: Simplify right side
    128,866x = 68,306,958,736
  5. Step 5: Solve for x
    x = 68,306,958,736/128,866
  6. Step 6: Final answer
    x = 530,061.91

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.