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Finding the Fourth Proportional to 111.42, 166.20 and 109.35

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Solution

The fourth proportional to 111.42, 166.20 and 109.35 is: 163.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.42 : 166.20 = 109.35 : x
  2. Step 2: Convert to fraction form
    111.42/166.20 = 109.35/x
  3. Step 3: Cross multiply
    111.42x = 166.20 × 109.35
  4. Step 4: Simplify right side
    111.42x = 18,173.97
  5. Step 5: Solve for x
    x = 18,173.97/111.42
  6. Step 6: Final answer
    x = 163.11

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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.