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Finding the Fourth Proportional to 111.75, 167.69 and 54.75

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Solution

The fourth proportional to 111.75, 167.69 and 54.75 is: 82.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.75 : 167.69 = 54.75 : x
  2. Step 2: Convert to fraction form
    111.75/167.69 = 54.75/x
  3. Step 3: Cross multiply
    111.75x = 167.69 × 54.75
  4. Step 4: Simplify right side
    111.75x = 9,180.75
  5. Step 5: Solve for x
    x = 9,180.75/111.75
  6. Step 6: Final answer
    x = 82.15

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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.