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Finding the Fourth Proportional to 68,109, 102,163.50 and 18,861

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Solution

The fourth proportional to 68,109, 102,163.50 and 18,861 is: 28,291.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,109 : 102,163.50 = 18,861 : x
  2. Step 2: Convert to fraction form
    68,109/102,163.50 = 18,861/x
  3. Step 3: Cross multiply
    68,109x = 102,163.50 × 18,861
  4. Step 4: Simplify right side
    68,109x = 1,926,905,773.50
  5. Step 5: Solve for x
    x = 1,926,905,773.50/68,109
  6. Step 6: Final answer
    x = 28,291.50

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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.