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Finding the Fourth Proportional to 110.85, 166.52 and 91.88

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Solution

The fourth proportional to 110.85, 166.52 and 91.88 is: 138.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.85 : 166.52 = 91.88 : x
  2. Step 2: Convert to fraction form
    110.85/166.52 = 91.88/x
  3. Step 3: Cross multiply
    110.85x = 166.52 × 91.88
  4. Step 4: Simplify right side
    110.85x = 15,299.86
  5. Step 5: Solve for x
    x = 15,299.86/110.85
  6. Step 6: Final answer
    x = 138.02

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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.