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Finding the Fourth Proportional to 8,659.44, 12,990.96 and 2,815.92

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Solution

The fourth proportional to 8,659.44, 12,990.96 and 2,815.92 is: 4,224.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.44 : 12,990.96 = 2,815.92 : x
  2. Step 2: Convert to fraction form
    8,659.44/12,990.96 = 2,815.92/x
  3. Step 3: Cross multiply
    8,659.44x = 12,990.96 × 2,815.92
  4. Step 4: Simplify right side
    8,659.44x = 36,581,504.08
  5. Step 5: Solve for x
    x = 36,581,504.08/8,659.44
  6. Step 6: Final answer
    x = 4,224.47

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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.