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Finding the Third Proportional to 391.38 and 531.38

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Solution

The third proportional to 391.38 and 531.38 is: 721.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.38 : 531.38 = 531.38 : x
  2. Step 2: Convert to fraction form
    391.38/531.38 = 531.38/x
  3. Step 3: Cross multiply
    391.38x = 531.38 × 531.38
  4. Step 4: Simplify right side
    391.38x = 282,359.39
  5. Step 5: Solve for x
    x = 282,359.39/391.38
  6. Step 6: Final answer
    x = 721.45

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.