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Finding the Fourth Proportional to 129.28, 194 and 83.66

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Solution

The fourth proportional to 129.28, 194 and 83.66 is: 125.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.28 : 194 = 83.66 : x
  2. Step 2: Convert to fraction form
    129.28/194 = 83.66/x
  3. Step 3: Cross multiply
    129.28x = 194 × 83.66
  4. Step 4: Simplify right side
    129.28x = 16,230.04
  5. Step 5: Solve for x
    x = 16,230.04/129.28
  6. Step 6: Final answer
    x = 125.54

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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.