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Finding the Fourth Proportional to 18,873.72, 28,299.12 and 7,787.64

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Solution

The fourth proportional to 18,873.72, 28,299.12 and 7,787.64 is: 11,676.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,873.72 : 28,299.12 = 7,787.64 : x
  2. Step 2: Convert to fraction form
    18,873.72/28,299.12 = 7,787.64/x
  3. Step 3: Cross multiply
    18,873.72x = 28,299.12 × 7,787.64
  4. Step 4: Simplify right side
    18,873.72x = 220,383,358.88
  5. Step 5: Solve for x
    x = 220,383,358.88/18,873.72
  6. Step 6: Final answer
    x = 11,676.73

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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.