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Finding the Fourth Proportional to 874.27, 1,311.37 and 326.41

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Solution

The fourth proportional to 874.27, 1,311.37 and 326.41 is: 489.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.27 : 1,311.37 = 326.41 : x
  2. Step 2: Convert to fraction form
    874.27/1,311.37 = 326.41/x
  3. Step 3: Cross multiply
    874.27x = 1,311.37 × 326.41
  4. Step 4: Simplify right side
    874.27x = 428,046.73
  5. Step 5: Solve for x
    x = 428,046.73/874.27
  6. Step 6: Final answer
    x = 489.60

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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.