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Finding the Third Proportional to 218,405 and 329,147

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Solution

The third proportional to 218,405 and 329,147 is: 496,040.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,405 : 329,147 = 329,147 : x
  2. Step 2: Convert to fraction form
    218,405/329,147 = 329,147/x
  3. Step 3: Cross multiply
    218,405x = 329,147 × 329,147
  4. Step 4: Simplify right side
    218,405x = 108,337,747,609
  5. Step 5: Solve for x
    x = 108,337,747,609/218,405
  6. Step 6: Final answer
    x = 496,040.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.