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Finding the Third Proportional to 391.25 and 581

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Solution

The third proportional to 391.25 and 581 is: 862.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.25 : 581 = 581 : x
  2. Step 2: Convert to fraction form
    391.25/581 = 581/x
  3. Step 3: Cross multiply
    391.25x = 581 × 581
  4. Step 4: Simplify right side
    391.25x = 337,561
  5. Step 5: Solve for x
    x = 337,561/391.25
  6. Step 6: Final answer
    x = 862.78

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.