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Finding the Fourth Proportional to 8,978.66, 13,489.90 and 8,481.32

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Solution

The fourth proportional to 8,978.66, 13,489.90 and 8,481.32 is: 12,742.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.66 : 13,489.90 = 8,481.32 : x
  2. Step 2: Convert to fraction form
    8,978.66/13,489.90 = 8,481.32/x
  3. Step 3: Cross multiply
    8,978.66x = 13,489.90 × 8,481.32
  4. Step 4: Simplify right side
    8,978.66x = 114,412,158.67
  5. Step 5: Solve for x
    x = 114,412,158.67/8,978.66
  6. Step 6: Final answer
    x = 12,742.68

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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.