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Finding the Fourth Proportional to 133.12, 199.41 and 81.64

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Solution

The fourth proportional to 133.12, 199.41 and 81.64 is: 122.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.12 : 199.41 = 81.64 : x
  2. Step 2: Convert to fraction form
    133.12/199.41 = 81.64/x
  3. Step 3: Cross multiply
    133.12x = 199.41 × 81.64
  4. Step 4: Simplify right side
    133.12x = 16,279.83
  5. Step 5: Solve for x
    x = 16,279.83/133.12
  6. Step 6: Final answer
    x = 122.29

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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.