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Finding the Fourth Proportional to 391.08, 586.18 and 131.02

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Solution

The fourth proportional to 391.08, 586.18 and 131.02 is: 196.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.08 : 586.18 = 131.02 : x
  2. Step 2: Convert to fraction form
    391.08/586.18 = 131.02/x
  3. Step 3: Cross multiply
    391.08x = 586.18 × 131.02
  4. Step 4: Simplify right side
    391.08x = 76,803.30
  5. Step 5: Solve for x
    x = 76,803.30/391.08
  6. Step 6: Final answer
    x = 196.39

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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.