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Finding the Third Proportional to 266,721 and 412,718

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Solution

The third proportional to 266,721 and 412,718 is: 638,630.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,721 : 412,718 = 412,718 : x
  2. Step 2: Convert to fraction form
    266,721/412,718 = 412,718/x
  3. Step 3: Cross multiply
    266,721x = 412,718 × 412,718
  4. Step 4: Simplify right side
    266,721x = 170,336,147,524
  5. Step 5: Solve for x
    x = 170,336,147,524/266,721
  6. Step 6: Final answer
    x = 638,630.43

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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.