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Finding the Fourth Proportional to 928.38, 1,391.60 and 440.86

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Solution

The fourth proportional to 928.38, 1,391.60 and 440.86 is: 660.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.38 : 1,391.60 = 440.86 : x
  2. Step 2: Convert to fraction form
    928.38/1,391.60 = 440.86/x
  3. Step 3: Cross multiply
    928.38x = 1,391.60 × 440.86
  4. Step 4: Simplify right side
    928.38x = 613,500.78
  5. Step 5: Solve for x
    x = 613,500.78/928.38
  6. Step 6: Final answer
    x = 660.83

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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.