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Finding the Fourth Proportional to 18,702.12, 28,057.02 and 7,608.78

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Solution

The fourth proportional to 18,702.12, 28,057.02 and 7,608.78 is: 11,414.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702.12 : 28,057.02 = 7,608.78 : x
  2. Step 2: Convert to fraction form
    18,702.12/28,057.02 = 7,608.78/x
  3. Step 3: Cross multiply
    18,702.12x = 28,057.02 × 7,608.78
  4. Step 4: Simplify right side
    18,702.12x = 213,479,692.64
  5. Step 5: Solve for x
    x = 213,479,692.64/18,702.12
  6. Step 6: Final answer
    x = 11,414.73

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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.