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Finding the Fourth Proportional to 92.20, 126.86 and 85

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Solution

The fourth proportional to 92.20, 126.86 and 85 is: 116.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.20 : 126.86 = 85 : x
  2. Step 2: Convert to fraction form
    92.20/126.86 = 85/x
  3. Step 3: Cross multiply
    92.20x = 126.86 × 85
  4. Step 4: Simplify right side
    92.20x = 10,783.10
  5. Step 5: Solve for x
    x = 10,783.10/92.20
  6. Step 6: Final answer
    x = 116.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.