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Finding the Fourth Proportional to 68,540.80, 102,811.20 and 40,892.80

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Solution

The fourth proportional to 68,540.80, 102,811.20 and 40,892.80 is: 61,339.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,540.80 : 102,811.20 = 40,892.80 : x
  2. Step 2: Convert to fraction form
    68,540.80/102,811.20 = 40,892.80/x
  3. Step 3: Cross multiply
    68,540.80x = 102,811.20 × 40,892.80
  4. Step 4: Simplify right side
    68,540.80x = 4,204,237,839.36
  5. Step 5: Solve for x
    x = 4,204,237,839.36/68,540.80
  6. Step 6: Final answer
    x = 61,339.20

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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.