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Finding the Fourth Proportional to 927.91, 1,391.87 and 311.61

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Solution

The fourth proportional to 927.91, 1,391.87 and 311.61 is: 467.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.91 : 1,391.87 = 311.61 : x
  2. Step 2: Convert to fraction form
    927.91/1,391.87 = 311.61/x
  3. Step 3: Cross multiply
    927.91x = 1,391.87 × 311.61
  4. Step 4: Simplify right side
    927.91x = 433,720.61
  5. Step 5: Solve for x
    x = 433,720.61/927.91
  6. Step 6: Final answer
    x = 467.42

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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.