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Finding the Fourth Proportional to 111.18, 166.86 and 80.76

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Solution

The fourth proportional to 111.18, 166.86 and 80.76 is: 121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.18 : 166.86 = 80.76 : x
  2. Step 2: Convert to fraction form
    111.18/166.86 = 80.76/x
  3. Step 3: Cross multiply
    111.18x = 166.86 × 80.76
  4. Step 4: Simplify right side
    111.18x = 13,475.61
  5. Step 5: Solve for x
    x = 13,475.61/111.18
  6. Step 6: Final answer
    x = 121.21

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.