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Finding the Fourth Proportional to 84.17, 126.98 and 80.39

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Solution

The fourth proportional to 84.17, 126.98 and 80.39 is: 121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.17 : 126.98 = 80.39 : x
  2. Step 2: Convert to fraction form
    84.17/126.98 = 80.39/x
  3. Step 3: Cross multiply
    84.17x = 126.98 × 80.39
  4. Step 4: Simplify right side
    84.17x = 10,206.89
  5. Step 5: Solve for x
    x = 10,206.89/84.17
  6. Step 6: Final answer
    x = 121.27

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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.