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Finding the Fourth Proportional to 91.42, 126.11 and 69.55

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Solution

The fourth proportional to 91.42, 126.11 and 69.55 is: 95.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.42 : 126.11 = 69.55 : x
  2. Step 2: Convert to fraction form
    91.42/126.11 = 69.55/x
  3. Step 3: Cross multiply
    91.42x = 126.11 × 69.55
  4. Step 4: Simplify right side
    91.42x = 8,770.95
  5. Step 5: Solve for x
    x = 8,770.95/91.42
  6. Step 6: Final answer
    x = 95.94

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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.