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Finding the Fourth Proportional to 68,422.86, 102,619.62 and 39,940.84

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Solution

The fourth proportional to 68,422.86, 102,619.62 and 39,940.84 is: 59,902.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,422.86 : 102,619.62 = 39,940.84 : x
  2. Step 2: Convert to fraction form
    68,422.86/102,619.62 = 39,940.84/x
  3. Step 3: Cross multiply
    68,422.86x = 102,619.62 × 39,940.84
  4. Step 4: Simplify right side
    68,422.86x = 4,098,713,823.28
  5. Step 5: Solve for x
    x = 4,098,713,823.28/68,422.86
  6. Step 6: Final answer
    x = 59,902.70

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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.