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Finding the Fourth Proportional to 90.11, 134.31 and 84.85

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Solution

The fourth proportional to 90.11, 134.31 and 84.85 is: 126.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.11 : 134.31 = 84.85 : x
  2. Step 2: Convert to fraction form
    90.11/134.31 = 84.85/x
  3. Step 3: Cross multiply
    90.11x = 134.31 × 84.85
  4. Step 4: Simplify right side
    90.11x = 11,396.20
  5. Step 5: Solve for x
    x = 11,396.20/90.11
  6. Step 6: Final answer
    x = 126.47

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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.