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Finding the Fourth Proportional to 206.78, 285.35 and 133.11

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Solution

The fourth proportional to 206.78, 285.35 and 133.11 is: 183.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.78 : 285.35 = 133.11 : x
  2. Step 2: Convert to fraction form
    206.78/285.35 = 133.11/x
  3. Step 3: Cross multiply
    206.78x = 285.35 × 133.11
  4. Step 4: Simplify right side
    206.78x = 37,982.27
  5. Step 5: Solve for x
    x = 37,982.27/206.78
  6. Step 6: Final answer
    x = 183.69

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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.