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Finding the Fourth Proportional to 874.28, 1,311.80 and 326.39

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Solution

The fourth proportional to 874.28, 1,311.80 and 326.39 is: 489.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.28 : 1,311.80 = 326.39 : x
  2. Step 2: Convert to fraction form
    874.28/1,311.80 = 326.39/x
  3. Step 3: Cross multiply
    874.28x = 1,311.80 × 326.39
  4. Step 4: Simplify right side
    874.28x = 428,158.40
  5. Step 5: Solve for x
    x = 428,158.40/874.28
  6. Step 6: Final answer
    x = 489.73

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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.