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Finding the Fourth Proportional to 391.38, 537.90 and 380.44

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Solution

The fourth proportional to 391.38, 537.90 and 380.44 is: 522.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.38 : 537.90 = 380.44 : x
  2. Step 2: Convert to fraction form
    391.38/537.90 = 380.44/x
  3. Step 3: Cross multiply
    391.38x = 537.90 × 380.44
  4. Step 4: Simplify right side
    391.38x = 204,636.77
  5. Step 5: Solve for x
    x = 204,636.77/391.38
  6. Step 6: Final answer
    x = 522.87

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.