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Finding the Fourth Proportional to 8,658.60, 12,979.92 and 2,812.20

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Solution

The fourth proportional to 8,658.60, 12,979.92 and 2,812.20 is: 4,215.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.60 : 12,979.92 = 2,812.20 : x
  2. Step 2: Convert to fraction form
    8,658.60/12,979.92 = 2,812.20/x
  3. Step 3: Cross multiply
    8,658.60x = 12,979.92 × 2,812.20
  4. Step 4: Simplify right side
    8,658.60x = 36,502,131.02
  5. Step 5: Solve for x
    x = 36,502,131.02/8,658.60
  6. Step 6: Final answer
    x = 4,215.71

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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.