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Finding the Fourth Proportional to 279.87, 385.57 and 196.83

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Solution

The fourth proportional to 279.87, 385.57 and 196.83 is: 271.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.87 : 385.57 = 196.83 : x
  2. Step 2: Convert to fraction form
    279.87/385.57 = 196.83/x
  3. Step 3: Cross multiply
    279.87x = 385.57 × 196.83
  4. Step 4: Simplify right side
    279.87x = 75,891.74
  5. Step 5: Solve for x
    x = 75,891.74/279.87
  6. Step 6: Final answer
    x = 271.17

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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.