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Finding the Fourth Proportional to 8,515.76, 12,773.76 and 3,321.76

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Solution

The fourth proportional to 8,515.76, 12,773.76 and 3,321.76 is: 4,982.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515.76 : 12,773.76 = 3,321.76 : x
  2. Step 2: Convert to fraction form
    8,515.76/12,773.76 = 3,321.76/x
  3. Step 3: Cross multiply
    8,515.76x = 12,773.76 × 3,321.76
  4. Step 4: Simplify right side
    8,515.76x = 42,431,365.02
  5. Step 5: Solve for x
    x = 42,431,365.02/8,515.76
  6. Step 6: Final answer
    x = 4,982.69

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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.