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Finding the Fourth Proportional to 18,819.64, 28,240.39 and 8,431.39

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Solution

The fourth proportional to 18,819.64, 28,240.39 and 8,431.39 is: 12,651.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.64 : 28,240.39 = 8,431.39 : x
  2. Step 2: Convert to fraction form
    18,819.64/28,240.39 = 8,431.39/x
  3. Step 3: Cross multiply
    18,819.64x = 28,240.39 × 8,431.39
  4. Step 4: Simplify right side
    18,819.64x = 238,105,650.16
  5. Step 5: Solve for x
    x = 238,105,650.16/18,819.64
  6. Step 6: Final answer
    x = 12,651.98

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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.