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Finding the Fourth Proportional to 133.00, 199.69 and 81.49

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Solution

The fourth proportional to 133.00, 199.69 and 81.49 is: 122.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.00 : 199.69 = 81.49 : x
  2. Step 2: Convert to fraction form
    133.00/199.69 = 81.49/x
  3. Step 3: Cross multiply
    133.00x = 199.69 × 81.49
  4. Step 4: Simplify right side
    133.00x = 16,272.49
  5. Step 5: Solve for x
    x = 16,272.49/133.00
  6. Step 6: Final answer
    x = 122.35

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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.