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Finding the Fourth Proportional to 80.26, 121.04 and 79.18

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Solution

The fourth proportional to 80.26, 121.04 and 79.18 is: 119.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.26 : 121.04 = 79.18 : x
  2. Step 2: Convert to fraction form
    80.26/121.04 = 79.18/x
  3. Step 3: Cross multiply
    80.26x = 121.04 × 79.18
  4. Step 4: Simplify right side
    80.26x = 9,583.25
  5. Step 5: Solve for x
    x = 9,583.25/80.26
  6. Step 6: Final answer
    x = 119.40

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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.