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Finding the Fourth Proportional to 8,551.60, 12,815.84 and 3,865.79

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Solution

The fourth proportional to 8,551.60, 12,815.84 and 3,865.79 is: 5,793.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,551.60 : 12,815.84 = 3,865.79 : x
  2. Step 2: Convert to fraction form
    8,551.60/12,815.84 = 3,865.79/x
  3. Step 3: Cross multiply
    8,551.60x = 12,815.84 × 3,865.79
  4. Step 4: Simplify right side
    8,551.60x = 49,543,387.82
  5. Step 5: Solve for x
    x = 49,543,387.82/8,551.60
  6. Step 6: Final answer
    x = 5,793.47

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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.