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Finding the Fourth Proportional to 68,122.64, 93,978.78 and 39,815.84

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Solution

The fourth proportional to 68,122.64, 93,978.78 and 39,815.84 is: 54,928.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,122.64 : 93,978.78 = 39,815.84 : x
  2. Step 2: Convert to fraction form
    68,122.64/93,978.78 = 39,815.84/x
  3. Step 3: Cross multiply
    68,122.64x = 93,978.78 × 39,815.84
  4. Step 4: Simplify right side
    68,122.64x = 3,741,844,067.88
  5. Step 5: Solve for x
    x = 3,741,844,067.88/68,122.64
  6. Step 6: Final answer
    x = 54,928.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.