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Finding the Fourth Proportional to 204.18, 306.29 and 82.42

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Solution

The fourth proportional to 204.18, 306.29 and 82.42 is: 123.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.18 : 306.29 = 82.42 : x
  2. Step 2: Convert to fraction form
    204.18/306.29 = 82.42/x
  3. Step 3: Cross multiply
    204.18x = 306.29 × 82.42
  4. Step 4: Simplify right side
    204.18x = 25,244.42
  5. Step 5: Solve for x
    x = 25,244.42/204.18
  6. Step 6: Final answer
    x = 123.64

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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.