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Finding the Fourth Proportional to 81.48, 122.20 and 33.38

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Solution

The fourth proportional to 81.48, 122.20 and 33.38 is: 50.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.48 : 122.20 = 33.38 : x
  2. Step 2: Convert to fraction form
    81.48/122.20 = 33.38/x
  3. Step 3: Cross multiply
    81.48x = 122.20 × 33.38
  4. Step 4: Simplify right side
    81.48x = 4,078.34
  5. Step 5: Solve for x
    x = 4,078.34/81.48
  6. Step 6: Final answer
    x = 50.05

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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.