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Finding the Fourth Proportional to 81.11, 121.67 and 27.00

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Solution

The fourth proportional to 81.11, 121.67 and 27.00 is: 40.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.11 : 121.67 = 27.00 : x
  2. Step 2: Convert to fraction form
    81.11/121.67 = 27.00/x
  3. Step 3: Cross multiply
    81.11x = 121.67 × 27.00
  4. Step 4: Simplify right side
    81.11x = 3,285.33
  5. Step 5: Solve for x
    x = 3,285.33/81.11
  6. Step 6: Final answer
    x = 40.50

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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.