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Finding the Fourth Proportional to 111.54, 167.31 and 54.50

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Solution

The fourth proportional to 111.54, 167.31 and 54.50 is: 81.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.54 : 167.31 = 54.50 : x
  2. Step 2: Convert to fraction form
    111.54/167.31 = 54.50/x
  3. Step 3: Cross multiply
    111.54x = 167.31 × 54.50
  4. Step 4: Simplify right side
    111.54x = 9,118.40
  5. Step 5: Solve for x
    x = 9,118.40/111.54
  6. Step 6: Final answer
    x = 81.75

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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.