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Finding the Fourth Proportional to 111.52, 167.40 and 81.10

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Solution

The fourth proportional to 111.52, 167.40 and 81.10 is: 121.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.52 : 167.40 = 81.10 : x
  2. Step 2: Convert to fraction form
    111.52/167.40 = 81.10/x
  3. Step 3: Cross multiply
    111.52x = 167.40 × 81.10
  4. Step 4: Simplify right side
    111.52x = 13,576.14
  5. Step 5: Solve for x
    x = 13,576.14/111.52
  6. Step 6: Final answer
    x = 121.74

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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.