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Finding the Fourth Proportional to 111.71, 167.63 and 81.33

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Solution

The fourth proportional to 111.71, 167.63 and 81.33 is: 122.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.71 : 167.63 = 81.33 : x
  2. Step 2: Convert to fraction form
    111.71/167.63 = 81.33/x
  3. Step 3: Cross multiply
    111.71x = 167.63 × 81.33
  4. Step 4: Simplify right side
    111.71x = 13,632.94
  5. Step 5: Solve for x
    x = 13,632.94/111.71
  6. Step 6: Final answer
    x = 122.04

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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.