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Finding the Fourth Proportional to 873.52, 1,310.98 and 818.78

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Solution

The fourth proportional to 873.52, 1,310.98 and 818.78 is: 1,228.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.52 : 1,310.98 = 818.78 : x
  2. Step 2: Convert to fraction form
    873.52/1,310.98 = 818.78/x
  3. Step 3: Cross multiply
    873.52x = 1,310.98 × 818.78
  4. Step 4: Simplify right side
    873.52x = 1,073,404.20
  5. Step 5: Solve for x
    x = 1,073,404.20/873.52
  6. Step 6: Final answer
    x = 1,228.83

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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.