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Finding the Fourth Proportional to 874.61, 1,311.87 and 326.90

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Solution

The fourth proportional to 874.61, 1,311.87 and 326.90 is: 490.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.61 : 1,311.87 = 326.90 : x
  2. Step 2: Convert to fraction form
    874.61/1,311.87 = 326.90/x
  3. Step 3: Cross multiply
    874.61x = 1,311.87 × 326.90
  4. Step 4: Simplify right side
    874.61x = 428,850.30
  5. Step 5: Solve for x
    x = 428,850.30/874.61
  6. Step 6: Final answer
    x = 490.33

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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.