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Finding the Fourth Proportional to 279.22, 418.84 and 163.78

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Solution

The fourth proportional to 279.22, 418.84 and 163.78 is: 245.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.22 : 418.84 = 163.78 : x
  2. Step 2: Convert to fraction form
    279.22/418.84 = 163.78/x
  3. Step 3: Cross multiply
    279.22x = 418.84 × 163.78
  4. Step 4: Simplify right side
    279.22x = 68,597.62
  5. Step 5: Solve for x
    x = 68,597.62/279.22
  6. Step 6: Final answer
    x = 245.68

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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.