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Finding the Fourth Proportional to 111.47, 166.68 and 109.85

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Solution

The fourth proportional to 111.47, 166.68 and 109.85 is: 164.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.47 : 166.68 = 109.85 : x
  2. Step 2: Convert to fraction form
    111.47/166.68 = 109.85/x
  3. Step 3: Cross multiply
    111.47x = 166.68 × 109.85
  4. Step 4: Simplify right side
    111.47x = 18,308.96
  5. Step 5: Solve for x
    x = 18,308.96/111.47
  6. Step 6: Final answer
    x = 164.26

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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.