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Finding the Fourth Proportional to 169.43, 254.09 and 87.11

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Solution

The fourth proportional to 169.43, 254.09 and 87.11 is: 130.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.43 : 254.09 = 87.11 : x
  2. Step 2: Convert to fraction form
    169.43/254.09 = 87.11/x
  3. Step 3: Cross multiply
    169.43x = 254.09 × 87.11
  4. Step 4: Simplify right side
    169.43x = 22,132.73
  5. Step 5: Solve for x
    x = 22,132.73/169.43
  6. Step 6: Final answer
    x = 130.63

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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.