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Finding the Fourth Proportional to 1,251.20, 1,874.61 and 812.88

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Solution

The fourth proportional to 1,251.20, 1,874.61 and 812.88 is: 1,217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.20 : 1,874.61 = 812.88 : x
  2. Step 2: Convert to fraction form
    1,251.20/1,874.61 = 812.88/x
  3. Step 3: Cross multiply
    1,251.20x = 1,874.61 × 812.88
  4. Step 4: Simplify right side
    1,251.20x = 1,523,832.98
  5. Step 5: Solve for x
    x = 1,523,832.98/1,251.20
  6. Step 6: Final answer
    x = 1,217.90

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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.