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Finding the Fourth Proportional to 80.80, 121.16 and 25.94

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Solution

The fourth proportional to 80.80, 121.16 and 25.94 is: 38.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.80 : 121.16 = 25.94 : x
  2. Step 2: Convert to fraction form
    80.80/121.16 = 25.94/x
  3. Step 3: Cross multiply
    80.80x = 121.16 × 25.94
  4. Step 4: Simplify right side
    80.80x = 3,143.06
  5. Step 5: Solve for x
    x = 3,143.06/80.80
  6. Step 6: Final answer
    x = 38.90

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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.