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Finding the Fourth Proportional to 18,915.62, 28,360.26 and 8,379.90

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Solution

The fourth proportional to 18,915.62, 28,360.26 and 8,379.90 is: 12,564.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.62 : 28,360.26 = 8,379.90 : x
  2. Step 2: Convert to fraction form
    18,915.62/28,360.26 = 8,379.90/x
  3. Step 3: Cross multiply
    18,915.62x = 28,360.26 × 8,379.90
  4. Step 4: Simplify right side
    18,915.62x = 237,656,142.77
  5. Step 5: Solve for x
    x = 237,656,142.77/18,915.62
  6. Step 6: Final answer
    x = 12,564.02

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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.