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Finding the Fourth Proportional to 204.78, 306.93 and 131.42

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Solution

The fourth proportional to 204.78, 306.93 and 131.42 is: 196.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.78 : 306.93 = 131.42 : x
  2. Step 2: Convert to fraction form
    204.78/306.93 = 131.42/x
  3. Step 3: Cross multiply
    204.78x = 306.93 × 131.42
  4. Step 4: Simplify right side
    204.78x = 40,335.21
  5. Step 5: Solve for x
    x = 40,335.21/204.78
  6. Step 6: Final answer
    x = 196.97

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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.