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Finding the Fourth Proportional to 279.41, 385.43 and 196.61

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Solution

The fourth proportional to 279.41, 385.43 and 196.61 is: 271.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.41 : 385.43 = 196.61 : x
  2. Step 2: Convert to fraction form
    279.41/385.43 = 196.61/x
  3. Step 3: Cross multiply
    279.41x = 385.43 × 196.61
  4. Step 4: Simplify right side
    279.41x = 75,776.48
  5. Step 5: Solve for x
    x = 75,776.48/279.41
  6. Step 6: Final answer
    x = 271.21

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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.