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Finding the Third Proportional to 391.92 and 548.02

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Solution

The third proportional to 391.92 and 548.02 is: 766.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.92 : 548.02 = 548.02 : x
  2. Step 2: Convert to fraction form
    391.92/548.02 = 548.02/x
  3. Step 3: Cross multiply
    391.92x = 548.02 × 548.02
  4. Step 4: Simplify right side
    391.92x = 300,321.13
  5. Step 5: Solve for x
    x = 300,321.13/391.92
  6. Step 6: Final answer
    x = 766.28

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.