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Finding the Fourth Proportional to 927.88, 1,391.85 and 311.60

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Solution

The fourth proportional to 927.88, 1,391.85 and 311.60 is: 467.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.88 : 1,391.85 = 311.60 : x
  2. Step 2: Convert to fraction form
    927.88/1,391.85 = 311.60/x
  3. Step 3: Cross multiply
    927.88x = 1,391.85 × 311.60
  4. Step 4: Simplify right side
    927.88x = 433,703.94
  5. Step 5: Solve for x
    x = 433,703.94/927.88
  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.