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Finding the Fourth Proportional to 92.74, 138.28 and 85.03

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Solution

The fourth proportional to 92.74, 138.28 and 85.03 is: 126.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.74 : 138.28 = 85.03 : x
  2. Step 2: Convert to fraction form
    92.74/138.28 = 85.03/x
  3. Step 3: Cross multiply
    92.74x = 138.28 × 85.03
  4. Step 4: Simplify right side
    92.74x = 11,757.52
  5. Step 5: Solve for x
    x = 11,757.52/92.74
  6. Step 6: Final answer
    x = 126.78

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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.