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Finding the Fourth Proportional to 279.40, 419.17 and 163.94

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Solution

The fourth proportional to 279.40, 419.17 and 163.94 is: 245.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.40 : 419.17 = 163.94 : x
  2. Step 2: Convert to fraction form
    279.40/419.17 = 163.94/x
  3. Step 3: Cross multiply
    279.40x = 419.17 × 163.94
  4. Step 4: Simplify right side
    279.40x = 68,716.86
  5. Step 5: Solve for x
    x = 68,716.86/279.40
  6. Step 6: Final answer
    x = 245.95

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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.