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Finding the Fourth Proportional to 311.11, 429.39 and 186.79

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Solution

The fourth proportional to 311.11, 429.39 and 186.79 is: 257.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.11 : 429.39 = 186.79 : x
  2. Step 2: Convert to fraction form
    311.11/429.39 = 186.79/x
  3. Step 3: Cross multiply
    311.11x = 429.39 × 186.79
  4. Step 4: Simplify right side
    311.11x = 80,205.76
  5. Step 5: Solve for x
    x = 80,205.76/311.11
  6. Step 6: Final answer
    x = 257.81

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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.