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Finding the Fourth Proportional to 91.75, 126.56 and 85.67

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Solution

The fourth proportional to 91.75, 126.56 and 85.67 is: 118.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.75 : 126.56 = 85.67 : x
  2. Step 2: Convert to fraction form
    91.75/126.56 = 85.67/x
  3. Step 3: Cross multiply
    91.75x = 126.56 × 85.67
  4. Step 4: Simplify right side
    91.75x = 10,843.16
  5. Step 5: Solve for x
    x = 10,843.16/91.75
  6. Step 6: Final answer
    x = 118.18

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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.