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Finding the Fourth Proportional to 111.70, 166.54 and 108.85

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Solution

The fourth proportional to 111.70, 166.54 and 108.85 is: 162.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.70 : 166.54 = 108.85 : x
  2. Step 2: Convert to fraction form
    111.70/166.54 = 108.85/x
  3. Step 3: Cross multiply
    111.70x = 166.54 × 108.85
  4. Step 4: Simplify right side
    111.70x = 18,127.88
  5. Step 5: Solve for x
    x = 18,127.88/111.70
  6. Step 6: Final answer
    x = 162.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.