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Finding the Fourth Proportional to 391.31, 586.89 and 131.27

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Solution

The fourth proportional to 391.31, 586.89 and 131.27 is: 196.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.31 : 586.89 = 131.27 : x
  2. Step 2: Convert to fraction form
    391.31/586.89 = 131.27/x
  3. Step 3: Cross multiply
    391.31x = 586.89 × 131.27
  4. Step 4: Simplify right side
    391.31x = 77,041.05
  5. Step 5: Solve for x
    x = 77,041.05/391.31
  6. Step 6: Final answer
    x = 196.88

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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.