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Finding the Fourth Proportional to 140.28, 194.04 and 128.76

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Solution

The fourth proportional to 140.28, 194.04 and 128.76 is: 178.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.28 : 194.04 = 128.76 : x
  2. Step 2: Convert to fraction form
    140.28/194.04 = 128.76/x
  3. Step 3: Cross multiply
    140.28x = 194.04 × 128.76
  4. Step 4: Simplify right side
    140.28x = 24,984.59
  5. Step 5: Solve for x
    x = 24,984.59/140.28
  6. Step 6: Final answer
    x = 178.11

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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.