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Finding the Fourth Proportional to 169.75, 254.72 and 84.25

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Solution

The fourth proportional to 169.75, 254.72 and 84.25 is: 126.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.75 : 254.72 = 84.25 : x
  2. Step 2: Convert to fraction form
    169.75/254.72 = 84.25/x
  3. Step 3: Cross multiply
    169.75x = 254.72 × 84.25
  4. Step 4: Simplify right side
    169.75x = 21,460.16
  5. Step 5: Solve for x
    x = 21,460.16/169.75
  6. Step 6: Final answer
    x = 126.42

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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.