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Finding the Fourth Proportional to 111.08, 166.64 and 76.85

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Solution

The fourth proportional to 111.08, 166.64 and 76.85 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.08 : 166.64 = 76.85 : x
  2. Step 2: Convert to fraction form
    111.08/166.64 = 76.85/x
  3. Step 3: Cross multiply
    111.08x = 166.64 × 76.85
  4. Step 4: Simplify right side
    111.08x = 12,805.07
  5. Step 5: Solve for x
    x = 12,805.07/111.08
  6. Step 6: Final answer
    x = 115.28

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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.