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Finding the Fourth Proportional to 92.74, 138.97 and 67.11

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Solution

The fourth proportional to 92.74, 138.97 and 67.11 is: 100.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.74 : 138.97 = 67.11 : x
  2. Step 2: Convert to fraction form
    92.74/138.97 = 67.11/x
  3. Step 3: Cross multiply
    92.74x = 138.97 × 67.11
  4. Step 4: Simplify right side
    92.74x = 9,327.20
  5. Step 5: Solve for x
    x = 9,327.20/92.74
  6. Step 6: Final answer
    x = 100.57

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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.