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Finding the Fourth Proportional to 68,791.72, 103,187.72 and 18,872.50

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Solution

The fourth proportional to 68,791.72, 103,187.72 and 18,872.50 is: 28,308.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,791.72 : 103,187.72 = 18,872.50 : x
  2. Step 2: Convert to fraction form
    68,791.72/103,187.72 = 18,872.50/x
  3. Step 3: Cross multiply
    68,791.72x = 103,187.72 × 18,872.50
  4. Step 4: Simplify right side
    68,791.72x = 1,947,410,245.70
  5. Step 5: Solve for x
    x = 1,947,410,245.70/68,791.72
  6. Step 6: Final answer
    x = 28,308.79

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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.