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Finding the Fourth Proportional to 80.67, 121.65 and 79.79

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Solution

The fourth proportional to 80.67, 121.65 and 79.79 is: 120.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.67 : 121.65 = 79.79 : x
  2. Step 2: Convert to fraction form
    80.67/121.65 = 79.79/x
  3. Step 3: Cross multiply
    80.67x = 121.65 × 79.79
  4. Step 4: Simplify right side
    80.67x = 9,706.05
  5. Step 5: Solve for x
    x = 9,706.05/80.67
  6. Step 6: Final answer
    x = 120.32

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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.