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Finding the Fourth Proportional to 91,171.94, 136,805.28 and 68,978.74

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Solution

The fourth proportional to 91,171.94, 136,805.28 and 68,978.74 is: 103,503.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,171.94 : 136,805.28 = 68,978.74 : x
  2. Step 2: Convert to fraction form
    91,171.94/136,805.28 = 68,978.74/x
  3. Step 3: Cross multiply
    91,171.94x = 136,805.28 × 68,978.74
  4. Step 4: Simplify right side
    91,171.94x = 9,436,655,839.75
  5. Step 5: Solve for x
    x = 9,436,655,839.75/91,171.94
  6. Step 6: Final answer
    x = 103,503.95

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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.