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Finding the Third Proportional to 391.88 and 862.13

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Solution

The third proportional to 391.88 and 862.13 is: 1,896.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.88 : 862.13 = 862.13 : x
  2. Step 2: Convert to fraction form
    391.88/862.13 = 862.13/x
  3. Step 3: Cross multiply
    391.88x = 862.13 × 862.13
  4. Step 4: Simplify right side
    391.88x = 743,259.52
  5. Step 5: Solve for x
    x = 743,259.52/391.88
  6. Step 6: Final answer
    x = 1,896.68

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.