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Finding the Fourth Proportional to 111.31, 166.66 and 91.87

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Solution

The fourth proportional to 111.31, 166.66 and 91.87 is: 137.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.31 : 166.66 = 91.87 : x
  2. Step 2: Convert to fraction form
    111.31/166.66 = 91.87/x
  3. Step 3: Cross multiply
    111.31x = 166.66 × 91.87
  4. Step 4: Simplify right side
    111.31x = 15,310.41
  5. Step 5: Solve for x
    x = 15,310.41/111.31
  6. Step 6: Final answer
    x = 137.55

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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.