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Finding the Fourth Proportional to 111.82, 167.82 and 85

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Solution

The fourth proportional to 111.82, 167.82 and 85 is: 127.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.82 : 167.82 = 85 : x
  2. Step 2: Convert to fraction form
    111.82/167.82 = 85/x
  3. Step 3: Cross multiply
    111.82x = 167.82 × 85
  4. Step 4: Simplify right side
    111.82x = 14,264.70
  5. Step 5: Solve for x
    x = 14,264.70/111.82
  6. Step 6: Final answer
    x = 127.57

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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.