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Finding the Fourth Proportional to 90.97, 125.60 and 84.85

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Solution

The fourth proportional to 90.97, 125.60 and 84.85 is: 117.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.97 : 125.60 = 84.85 : x
  2. Step 2: Convert to fraction form
    90.97/125.60 = 84.85/x
  3. Step 3: Cross multiply
    90.97x = 125.60 × 84.85
  4. Step 4: Simplify right side
    90.97x = 10,656.90
  5. Step 5: Solve for x
    x = 10,656.90/90.97
  6. Step 6: Final answer
    x = 117.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.