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Finding the Fourth Proportional to 90.17, 134.31 and 84.55

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Solution

The fourth proportional to 90.17, 134.31 and 84.55 is: 125.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.17 : 134.31 = 84.55 : x
  2. Step 2: Convert to fraction form
    90.17/134.31 = 84.55/x
  3. Step 3: Cross multiply
    90.17x = 134.31 × 84.55
  4. Step 4: Simplify right side
    90.17x = 11,355.57
  5. Step 5: Solve for x
    x = 11,355.57/90.17
  6. Step 6: Final answer
    x = 125.93

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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.