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Finding the Fourth Proportional to 91.82, 137.73 and 69.12

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Solution

The fourth proportional to 91.82, 137.73 and 69.12 is: 103.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.82 : 137.73 = 69.12 : x
  2. Step 2: Convert to fraction form
    91.82/137.73 = 69.12/x
  3. Step 3: Cross multiply
    91.82x = 137.73 × 69.12
  4. Step 4: Simplify right side
    91.82x = 9,519.90
  5. Step 5: Solve for x
    x = 9,519.90/91.82
  6. Step 6: Final answer
    x = 103.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.