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Finding the Fourth Proportional to 133.34, 199.60 and 81.83

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Solution

The fourth proportional to 133.34, 199.60 and 81.83 is: 122.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.34 : 199.60 = 81.83 : x
  2. Step 2: Convert to fraction form
    133.34/199.60 = 81.83/x
  3. Step 3: Cross multiply
    133.34x = 199.60 × 81.83
  4. Step 4: Simplify right side
    133.34x = 16,333.56
  5. Step 5: Solve for x
    x = 16,333.56/133.34
  6. Step 6: Final answer
    x = 122.50

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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.