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Finding the Fourth Proportional to 80.55, 121.46 and 79.54

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Solution

The fourth proportional to 80.55, 121.46 and 79.54 is: 119.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.55 : 121.46 = 79.54 : x
  2. Step 2: Convert to fraction form
    80.55/121.46 = 79.54/x
  3. Step 3: Cross multiply
    80.55x = 121.46 × 79.54
  4. Step 4: Simplify right side
    80.55x = 9,660.23
  5. Step 5: Solve for x
    x = 9,660.23/80.55
  6. Step 6: Final answer
    x = 119.93

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.