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Finding the Fourth Proportional to 129.40, 194.05 and 80.67

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Solution

The fourth proportional to 129.40, 194.05 and 80.67 is: 120.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.40 : 194.05 = 80.67 : x
  2. Step 2: Convert to fraction form
    129.40/194.05 = 80.67/x
  3. Step 3: Cross multiply
    129.40x = 194.05 × 80.67
  4. Step 4: Simplify right side
    129.40x = 15,653.84
  5. Step 5: Solve for x
    x = 15,653.84/129.40
  6. Step 6: Final answer
    x = 120.97

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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.