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Finding the Third Proportional to 391.25 and 425

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Solution

The third proportional to 391.25 and 425 is: 461.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.25 : 425 = 425 : x
  2. Step 2: Convert to fraction form
    391.25/425 = 425/x
  3. Step 3: Cross multiply
    391.25x = 425 × 425
  4. Step 4: Simplify right side
    391.25x = 180,625
  5. Step 5: Solve for x
    x = 180,625/391.25
  6. Step 6: Final answer
    x = 461.66

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.