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Finding the Fourth Proportional to 391.28, 586.92 and 131.57

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Solution

The fourth proportional to 391.28, 586.92 and 131.57 is: 197.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.28 : 586.92 = 131.57 : x
  2. Step 2: Convert to fraction form
    391.28/586.92 = 131.57/x
  3. Step 3: Cross multiply
    391.28x = 586.92 × 131.57
  4. Step 4: Simplify right side
    391.28x = 77,219.84
  5. Step 5: Solve for x
    x = 77,219.84/391.28
  6. Step 6: Final answer
    x = 197.35

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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.