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Finding the Fourth Proportional to 194.28, 267.92 and 128.66

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Solution

The fourth proportional to 194.28, 267.92 and 128.66 is: 177.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.28 : 267.92 = 128.66 : x
  2. Step 2: Convert to fraction form
    194.28/267.92 = 128.66/x
  3. Step 3: Cross multiply
    194.28x = 267.92 × 128.66
  4. Step 4: Simplify right side
    194.28x = 34,470.59
  5. Step 5: Solve for x
    x = 34,470.59/194.28
  6. Step 6: Final answer
    x = 177.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.