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Finding the Fourth Proportional to 133.14, 199.26 and 81.66

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Solution

The fourth proportional to 133.14, 199.26 and 81.66 is: 122.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.14 : 199.26 = 81.66 : x
  2. Step 2: Convert to fraction form
    133.14/199.26 = 81.66/x
  3. Step 3: Cross multiply
    133.14x = 199.26 × 81.66
  4. Step 4: Simplify right side
    133.14x = 16,271.57
  5. Step 5: Solve for x
    x = 16,271.57/133.14
  6. Step 6: Final answer
    x = 122.21

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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.