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Finding the Fourth Proportional to 311.11, 429.51 and 200.75

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Solution

The fourth proportional to 311.11, 429.51 and 200.75 is: 277.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.11 : 429.51 = 200.75 : x
  2. Step 2: Convert to fraction form
    311.11/429.51 = 200.75/x
  3. Step 3: Cross multiply
    311.11x = 429.51 × 200.75
  4. Step 4: Simplify right side
    311.11x = 86,223.06
  5. Step 5: Solve for x
    x = 86,223.06/311.11
  6. Step 6: Final answer
    x = 277.15

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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.