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Finding the Fourth Proportional to 874.52, 1,311.90 and 326.90

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Solution

The fourth proportional to 874.52, 1,311.90 and 326.90 is: 490.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.52 : 1,311.90 = 326.90 : x
  2. Step 2: Convert to fraction form
    874.52/1,311.90 = 326.90/x
  3. Step 3: Cross multiply
    874.52x = 1,311.90 × 326.90
  4. Step 4: Simplify right side
    874.52x = 428,860.11
  5. Step 5: Solve for x
    x = 428,860.11/874.52
  6. Step 6: Final answer
    x = 490.39

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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.