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Finding the Fourth Proportional to 391.41, 587.11 and 102.85

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Solution

The fourth proportional to 391.41, 587.11 and 102.85 is: 154.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.41 : 587.11 = 102.85 : x
  2. Step 2: Convert to fraction form
    391.41/587.11 = 102.85/x
  3. Step 3: Cross multiply
    391.41x = 587.11 × 102.85
  4. Step 4: Simplify right side
    391.41x = 60,382.54
  5. Step 5: Solve for x
    x = 60,382.54/391.41
  6. Step 6: Final answer
    x = 154.27

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