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Finding the Fourth Proportional to 133.38, 200.31 and 82.11

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Solution

The fourth proportional to 133.38, 200.31 and 82.11 is: 123.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.38 : 200.31 = 82.11 : x
  2. Step 2: Convert to fraction form
    133.38/200.31 = 82.11/x
  3. Step 3: Cross multiply
    133.38x = 200.31 × 82.11
  4. Step 4: Simplify right side
    133.38x = 16,447.90
  5. Step 5: Solve for x
    x = 16,447.90/133.38
  6. Step 6: Final answer
    x = 123.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.