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Finding the Fourth Proportional to 279,261.21, 418,891.82 and 129,481.78

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Solution

The fourth proportional to 279,261.21, 418,891.82 and 129,481.78 is: 194,222.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,261.21 : 418,891.82 = 129,481.78 : x
  2. Step 2: Convert to fraction form
    279,261.21/418,891.82 = 129,481.78/x
  3. Step 3: Cross multiply
    279,261.21x = 418,891.82 × 129,481.78
  4. Step 4: Simplify right side
    279,261.21x = 54,238,858,481.04
  5. Step 5: Solve for x
    x = 54,238,858,481.04/279,261.21
  6. Step 6: Final answer
    x = 194,222.67

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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.