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Finding the Fourth Proportional to 169.42, 254.20 and 82.80

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Solution

The fourth proportional to 169.42, 254.20 and 82.80 is: 124.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.42 : 254.20 = 82.80 : x
  2. Step 2: Convert to fraction form
    169.42/254.20 = 82.80/x
  3. Step 3: Cross multiply
    169.42x = 254.20 × 82.80
  4. Step 4: Simplify right side
    169.42x = 21,047.76
  5. Step 5: Solve for x
    x = 21,047.76/169.42
  6. Step 6: Final answer
    x = 124.23

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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.