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Finding the Fourth Proportional to 12,915.21, 19,372.13 and 4,149.44

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Solution

The fourth proportional to 12,915.21, 19,372.13 and 4,149.44 is: 6,223.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.21 : 19,372.13 = 4,149.44 : x
  2. Step 2: Convert to fraction form
    12,915.21/19,372.13 = 4,149.44/x
  3. Step 3: Cross multiply
    12,915.21x = 19,372.13 × 4,149.44
  4. Step 4: Simplify right side
    12,915.21x = 80,383,549.91
  5. Step 5: Solve for x
    x = 80,383,549.91/12,915.21
  6. Step 6: Final answer
    x = 6,223.94

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.