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Finding the Fourth Proportional to 311.73, 429.86 and 206.79

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Solution

The fourth proportional to 311.73, 429.86 and 206.79 is: 285.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.73 : 429.86 = 206.79 : x
  2. Step 2: Convert to fraction form
    311.73/429.86 = 206.79/x
  3. Step 3: Cross multiply
    311.73x = 429.86 × 206.79
  4. Step 4: Simplify right side
    311.73x = 88,890.49
  5. Step 5: Solve for x
    x = 88,890.49/311.73
  6. Step 6: Final answer
    x = 285.15

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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.