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Finding the Third Proportional to 275,866 and 421,799

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Solution

The third proportional to 275,866 and 421,799 is: 644,930.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,866 : 421,799 = 421,799 : x
  2. Step 2: Convert to fraction form
    275,866/421,799 = 421,799/x
  3. Step 3: Cross multiply
    275,866x = 421,799 × 421,799
  4. Step 4: Simplify right side
    275,866x = 177,914,396,401
  5. Step 5: Solve for x
    x = 177,914,396,401/275,866
  6. Step 6: Final answer
    x = 644,930.50

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.