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Finding the Fourth Proportional to 80.81, 121.18 and 26.69

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Solution

The fourth proportional to 80.81, 121.18 and 26.69 is: 40.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.81 : 121.18 = 26.69 : x
  2. Step 2: Convert to fraction form
    80.81/121.18 = 26.69/x
  3. Step 3: Cross multiply
    80.81x = 121.18 × 26.69
  4. Step 4: Simplify right side
    80.81x = 3,233.92
  5. Step 5: Solve for x
    x = 3,233.92/80.81
  6. Step 6: Final answer
    x = 40.02

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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.