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Finding the Fourth Proportional to 68,761.10, 103,141.72 and 18,841.60

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Solution

The fourth proportional to 68,761.10, 103,141.72 and 18,841.60 is: 28,262.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,761.10 : 103,141.72 = 18,841.60 : x
  2. Step 2: Convert to fraction form
    68,761.10/103,141.72 = 18,841.60/x
  3. Step 3: Cross multiply
    68,761.10x = 103,141.72 × 18,841.60
  4. Step 4: Simplify right side
    68,761.10x = 1,943,355,031.55
  5. Step 5: Solve for x
    x = 1,943,355,031.55/68,761.10
  6. Step 6: Final answer
    x = 28,262.42

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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.