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Finding the Fourth Proportional to 111.15, 166.89 and 74.61

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Solution

The fourth proportional to 111.15, 166.89 and 74.61 is: 112.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.15 : 166.89 = 74.61 : x
  2. Step 2: Convert to fraction form
    111.15/166.89 = 74.61/x
  3. Step 3: Cross multiply
    111.15x = 166.89 × 74.61
  4. Step 4: Simplify right side
    111.15x = 12,451.66
  5. Step 5: Solve for x
    x = 12,451.66/111.15
  6. Step 6: Final answer
    x = 112.03

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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.