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Finding the Fourth Proportional to 613.38, 845.68 and 391.96

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Solution

The fourth proportional to 613.38, 845.68 and 391.96 is: 540.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.38 : 845.68 = 391.96 : x
  2. Step 2: Convert to fraction form
    613.38/845.68 = 391.96/x
  3. Step 3: Cross multiply
    613.38x = 845.68 × 391.96
  4. Step 4: Simplify right side
    613.38x = 331,472.73
  5. Step 5: Solve for x
    x = 331,472.73/613.38
  6. Step 6: Final answer
    x = 540.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.