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Finding the Fourth Proportional to 129.70, 194.12 and 80.94

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Solution

The fourth proportional to 129.70, 194.12 and 80.94 is: 121.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.70 : 194.12 = 80.94 : x
  2. Step 2: Convert to fraction form
    129.70/194.12 = 80.94/x
  3. Step 3: Cross multiply
    129.70x = 194.12 × 80.94
  4. Step 4: Simplify right side
    129.70x = 15,711.49
  5. Step 5: Solve for x
    x = 15,711.49/129.70
  6. Step 6: Final answer
    x = 121.13

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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.