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Finding the Fourth Proportional to 204.12, 305.69 and 122.78

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Solution

The fourth proportional to 204.12, 305.69 and 122.78 is: 183.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.12 : 305.69 = 122.78 : x
  2. Step 2: Convert to fraction form
    204.12/305.69 = 122.78/x
  3. Step 3: Cross multiply
    204.12x = 305.69 × 122.78
  4. Step 4: Simplify right side
    204.12x = 37,532.77
  5. Step 5: Solve for x
    x = 37,532.77/204.12
  6. Step 6: Final answer
    x = 183.88

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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.