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Finding the Fourth Proportional to 279.38, 385.44 and 179.78

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Solution

The fourth proportional to 279.38, 385.44 and 179.78 is: 248.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.38 : 385.44 = 179.78 : x
  2. Step 2: Convert to fraction form
    279.38/385.44 = 179.78/x
  3. Step 3: Cross multiply
    279.38x = 385.44 × 179.78
  4. Step 4: Simplify right side
    279.38x = 69,293.97
  5. Step 5: Solve for x
    x = 69,293.97/279.38
  6. Step 6: Final answer
    x = 248.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.