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Finding the Third Proportional to 275,462 and 421,108

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Solution

The third proportional to 275,462 and 421,108 is: 643,761.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,462 : 421,108 = 421,108 : x
  2. Step 2: Convert to fraction form
    275,462/421,108 = 421,108/x
  3. Step 3: Cross multiply
    275,462x = 421,108 × 421,108
  4. Step 4: Simplify right side
    275,462x = 177,331,947,664
  5. Step 5: Solve for x
    x = 177,331,947,664/275,462
  6. Step 6: Final answer
    x = 643,761.93

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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.