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Finding the Fourth Proportional to 391.26, 586.85 and 131.25

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Solution

The fourth proportional to 391.26, 586.85 and 131.25 is: 196.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.26 : 586.85 = 131.25 : x
  2. Step 2: Convert to fraction form
    391.26/586.85 = 131.25/x
  3. Step 3: Cross multiply
    391.26x = 586.85 × 131.25
  4. Step 4: Simplify right side
    391.26x = 77,025.61
  5. Step 5: Solve for x
    x = 77,025.61/391.26
  6. Step 6: Final answer
    x = 196.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.