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Finding the Third Proportional to 331.78 and 487.97

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Solution

The third proportional to 331.78 and 487.97 is: 717.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.78 : 487.97 = 487.97 : x
  2. Step 2: Convert to fraction form
    331.78/487.97 = 487.97/x
  3. Step 3: Cross multiply
    331.78x = 487.97 × 487.97
  4. Step 4: Simplify right side
    331.78x = 238,113.50
  5. Step 5: Solve for x
    x = 238,113.50/331.78
  6. Step 6: Final answer
    x = 717.68

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.