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Finding the Fourth Proportional to 279.70, 385.41 and 196.90

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Solution

The fourth proportional to 279.70, 385.41 and 196.90 is: 271.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.70 : 385.41 = 196.90 : x
  2. Step 2: Convert to fraction form
    279.70/385.41 = 196.90/x
  3. Step 3: Cross multiply
    279.70x = 385.41 × 196.90
  4. Step 4: Simplify right side
    279.70x = 75,887.23
  5. Step 5: Solve for x
    x = 75,887.23/279.70
  6. Step 6: Final answer
    x = 271.32

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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.