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Finding the Fourth Proportional to 206.15, 285.89 and 198.86

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Solution

The fourth proportional to 206.15, 285.89 and 198.86 is: 275.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.15 : 285.89 = 198.86 : x
  2. Step 2: Convert to fraction form
    206.15/285.89 = 198.86/x
  3. Step 3: Cross multiply
    206.15x = 285.89 × 198.86
  4. Step 4: Simplify right side
    206.15x = 56,849.66
  5. Step 5: Solve for x
    x = 56,849.66/206.15
  6. Step 6: Final answer
    x = 275.78

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.