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Finding the Fourth Proportional to 281,399.80, 422,121.68 and 81,723.48

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Solution

The fourth proportional to 281,399.80, 422,121.68 and 81,723.48 is: 122,591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,399.80 : 422,121.68 = 81,723.48 : x
  2. Step 2: Convert to fraction form
    281,399.80/422,121.68 = 81,723.48/x
  3. Step 3: Cross multiply
    281,399.80x = 422,121.68 × 81,723.48
  4. Step 4: Simplify right side
    281,399.80x = 34,497,252,673.05
  5. Step 5: Solve for x
    x = 34,497,252,673.05/281,399.80
  6. Step 6: Final answer
    x = 122,591.60

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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.