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Finding the Fourth Proportional to 169.45, 254.15 and 81.55

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Solution

The fourth proportional to 169.45, 254.15 and 81.55 is: 122.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.45 : 254.15 = 81.55 : x
  2. Step 2: Convert to fraction form
    169.45/254.15 = 81.55/x
  3. Step 3: Cross multiply
    169.45x = 254.15 × 81.55
  4. Step 4: Simplify right side
    169.45x = 20,725.93
  5. Step 5: Solve for x
    x = 20,725.93/169.45
  6. Step 6: Final answer
    x = 122.31

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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.