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Finding the Fourth Proportional to 20,843.88, 28,767.30 and 11,889.32

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Solution

The fourth proportional to 20,843.88, 28,767.30 and 11,889.32 is: 16,408.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,843.88 : 28,767.30 = 11,889.32 : x
  2. Step 2: Convert to fraction form
    20,843.88/28,767.30 = 11,889.32/x
  3. Step 3: Cross multiply
    20,843.88x = 28,767.30 × 11,889.32
  4. Step 4: Simplify right side
    20,843.88x = 342,023,635.24
  5. Step 5: Solve for x
    x = 342,023,635.24/20,843.88
  6. Step 6: Final answer
    x = 16,408.83

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.