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Finding the Fourth Proportional to 8,660.55, 12,992.19 and 2,815.79

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Solution

The fourth proportional to 8,660.55, 12,992.19 and 2,815.79 is: 4,224.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.55 : 12,992.19 = 2,815.79 : x
  2. Step 2: Convert to fraction form
    8,660.55/12,992.19 = 2,815.79/x
  3. Step 3: Cross multiply
    8,660.55x = 12,992.19 × 2,815.79
  4. Step 4: Simplify right side
    8,660.55x = 36,583,311.16
  5. Step 5: Solve for x
    x = 36,583,311.16/8,660.55
  6. Step 6: Final answer
    x = 4,224.13

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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.