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Finding the Fourth Proportional to 84.62, 126.10 and 81.87

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Solution

The fourth proportional to 84.62, 126.10 and 81.87 is: 121.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.62 : 126.10 = 81.87 : x
  2. Step 2: Convert to fraction form
    84.62/126.10 = 81.87/x
  3. Step 3: Cross multiply
    84.62x = 126.10 × 81.87
  4. Step 4: Simplify right side
    84.62x = 10,323.44
  5. Step 5: Solve for x
    x = 10,323.44/84.62
  6. Step 6: Final answer
    x = 121.99

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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.