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Finding the Fourth Proportional to 8,321.78, 12,479.19 and 3,388.07

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Solution

The fourth proportional to 8,321.78, 12,479.19 and 3,388.07 is: 5,080.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,321.78 : 12,479.19 = 3,388.07 : x
  2. Step 2: Convert to fraction form
    8,321.78/12,479.19 = 3,388.07/x
  3. Step 3: Cross multiply
    8,321.78x = 12,479.19 × 3,388.07
  4. Step 4: Simplify right side
    8,321.78x = 42,280,306.87
  5. Step 5: Solve for x
    x = 42,280,306.87/8,321.78
  6. Step 6: Final answer
    x = 5,080.68

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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.