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Finding the Fourth Proportional to 169.31, 254.07 and 128.68

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Solution

The fourth proportional to 169.31, 254.07 and 128.68 is: 193.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.31 : 254.07 = 128.68 : x
  2. Step 2: Convert to fraction form
    169.31/254.07 = 128.68/x
  3. Step 3: Cross multiply
    169.31x = 254.07 × 128.68
  4. Step 4: Simplify right side
    169.31x = 32,693.09
  5. Step 5: Solve for x
    x = 32,693.09/169.31
  6. Step 6: Final answer
    x = 193.09

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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.