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Finding the Fourth Proportional to 169.90, 254.92 and 84.40

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Solution

The fourth proportional to 169.90, 254.92 and 84.40 is: 126.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.90 : 254.92 = 84.40 : x
  2. Step 2: Convert to fraction form
    169.90/254.92 = 84.40/x
  3. Step 3: Cross multiply
    169.90x = 254.92 × 84.40
  4. Step 4: Simplify right side
    169.90x = 21,515.25
  5. Step 5: Solve for x
    x = 21,515.25/169.90
  6. Step 6: Final answer
    x = 126.63

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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.