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Finding the Fourth Proportional to 84.97, 126.82 and 82.92

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Solution

The fourth proportional to 84.97, 126.82 and 82.92 is: 123.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.97 : 126.82 = 82.92 : x
  2. Step 2: Convert to fraction form
    84.97/126.82 = 82.92/x
  3. Step 3: Cross multiply
    84.97x = 126.82 × 82.92
  4. Step 4: Simplify right side
    84.97x = 10,514.87
  5. Step 5: Solve for x
    x = 10,514.87/84.97
  6. Step 6: Final answer
    x = 123.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.