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Finding the Fourth Proportional to 204.78, 306.79 and 158.91

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Solution

The fourth proportional to 204.78, 306.79 and 158.91 is: 238.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    204.78 : 306.79 = 158.91 : x
  2. Step 2: Convert to fraction form
    204.78/306.79 = 158.91/x
  3. Step 3: Cross multiply
    204.78x = 306.79 × 158.91
  4. Step 4: Simplify right side
    204.78x = 48,750.45
  5. Step 5: Solve for x
    x = 48,750.45/204.78
  6. Step 6: Final answer
    x = 238.06

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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.