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Finding the Fourth Proportional to 111.06, 166.71 and 80.68

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Solution

The fourth proportional to 111.06, 166.71 and 80.68 is: 121.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.06 : 166.71 = 80.68 : x
  2. Step 2: Convert to fraction form
    111.06/166.71 = 80.68/x
  3. Step 3: Cross multiply
    111.06x = 166.71 × 80.68
  4. Step 4: Simplify right side
    111.06x = 13,450.16
  5. Step 5: Solve for x
    x = 13,450.16/111.06
  6. Step 6: Final answer
    x = 121.11

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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.