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Finding the Fourth Proportional to 91,906.80, 137,860.20 and 68,578.80

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Solution

The fourth proportional to 91,906.80, 137,860.20 and 68,578.80 is: 102,868.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,906.80 : 137,860.20 = 68,578.80 : x
  2. Step 2: Convert to fraction form
    91,906.80/137,860.20 = 68,578.80/x
  3. Step 3: Cross multiply
    91,906.80x = 137,860.20 × 68,578.80
  4. Step 4: Simplify right side
    91,906.80x = 9,454,287,083.76
  5. Step 5: Solve for x
    x = 9,454,287,083.76/91,906.80
  6. Step 6: Final answer
    x = 102,868.20

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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.