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Finding the Fourth Proportional to 91.67, 136.82 and 76.28

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Solution

The fourth proportional to 91.67, 136.82 and 76.28 is: 113.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.67 : 136.82 = 76.28 : x
  2. Step 2: Convert to fraction form
    91.67/136.82 = 76.28/x
  3. Step 3: Cross multiply
    91.67x = 136.82 × 76.28
  4. Step 4: Simplify right side
    91.67x = 10,436.14
  5. Step 5: Solve for x
    x = 10,436.14/91.67
  6. Step 6: Final answer
    x = 113.85

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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.