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Finding the Fourth Proportional to 92.21, 138.19 and 69.36

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Solution

The fourth proportional to 92.21, 138.19 and 69.36 is: 103.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.21 : 138.19 = 69.36 : x
  2. Step 2: Convert to fraction form
    92.21/138.19 = 69.36/x
  3. Step 3: Cross multiply
    92.21x = 138.19 × 69.36
  4. Step 4: Simplify right side
    92.21x = 9,583.82
  5. Step 5: Solve for x
    x = 9,583.82/92.21
  6. Step 6: Final answer
    x = 103.94

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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.