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Finding the Fourth Proportional to 8,611.26, 12,915.11 and 3,929.96

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Solution

The fourth proportional to 8,611.26, 12,915.11 and 3,929.96 is: 5,894.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.26 : 12,915.11 = 3,929.96 : x
  2. Step 2: Convert to fraction form
    8,611.26/12,915.11 = 3,929.96/x
  3. Step 3: Cross multiply
    8,611.26x = 12,915.11 × 3,929.96
  4. Step 4: Simplify right side
    8,611.26x = 50,755,781.47
  5. Step 5: Solve for x
    x = 50,755,781.47/8,611.26
  6. Step 6: Final answer
    x = 5,894.12

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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.