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Finding the Fourth Proportional to 8,658.59, 12,990.98 and 2,815.22

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Solution

The fourth proportional to 8,658.59, 12,990.98 and 2,815.22 is: 4,223.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.59 : 12,990.98 = 2,815.22 : x
  2. Step 2: Convert to fraction form
    8,658.59/12,990.98 = 2,815.22/x
  3. Step 3: Cross multiply
    8,658.59x = 12,990.98 × 2,815.22
  4. Step 4: Simplify right side
    8,658.59x = 36,572,387.68
  5. Step 5: Solve for x
    x = 36,572,387.68/8,658.59
  6. Step 6: Final answer
    x = 4,223.83

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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.