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Finding the Fourth Proportional to 83.98, 126.74 and 81.82

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Solution

The fourth proportional to 83.98, 126.74 and 81.82 is: 123.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.98 : 126.74 = 81.82 : x
  2. Step 2: Convert to fraction form
    83.98/126.74 = 81.82/x
  3. Step 3: Cross multiply
    83.98x = 126.74 × 81.82
  4. Step 4: Simplify right side
    83.98x = 10,369.87
  5. Step 5: Solve for x
    x = 10,369.87/83.98
  6. Step 6: Final answer
    x = 123.48

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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.