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Finding the Fourth Proportional to 68,759.17, 103,138.85 and 18,839.70

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Solution

The fourth proportional to 68,759.17, 103,138.85 and 18,839.70 is: 28,259.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,759.17 : 103,138.85 = 18,839.70 : x
  2. Step 2: Convert to fraction form
    68,759.17/103,138.85 = 18,839.70/x
  3. Step 3: Cross multiply
    68,759.17x = 103,138.85 × 18,839.70
  4. Step 4: Simplify right side
    68,759.17x = 1,943,104,992.35
  5. Step 5: Solve for x
    x = 1,943,104,992.35/68,759.17
  6. Step 6: Final answer
    x = 28,259.58

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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.