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Finding the Fourth Proportional to 68,759.67, 103,139.60 and 18,840.20

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Solution

The fourth proportional to 68,759.67, 103,139.60 and 18,840.20 is: 28,260.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,759.67 : 103,139.60 = 18,840.20 : x
  2. Step 2: Convert to fraction form
    68,759.67/103,139.60 = 18,840.20/x
  3. Step 3: Cross multiply
    68,759.67x = 103,139.60 × 18,840.20
  4. Step 4: Simplify right side
    68,759.67x = 1,943,170,691.92
  5. Step 5: Solve for x
    x = 1,943,170,691.92/68,759.67
  6. Step 6: Final answer
    x = 28,260.33

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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.