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Finding the Fourth Proportional to 391.75, 587.85 and 145.13

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Solution

The fourth proportional to 391.75, 587.85 and 145.13 is: 217.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.75 : 587.85 = 145.13 : x
  2. Step 2: Convert to fraction form
    391.75/587.85 = 145.13/x
  3. Step 3: Cross multiply
    391.75x = 587.85 × 145.13
  4. Step 4: Simplify right side
    391.75x = 85,311.60
  5. Step 5: Solve for x
    x = 85,311.60/391.75
  6. Step 6: Final answer
    x = 217.77

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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.