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Finding the Fourth Proportional to 129.81, 195.61 and 107.49

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Solution

The fourth proportional to 129.81, 195.61 and 107.49 is: 161.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.81 : 195.61 = 107.49 : x
  2. Step 2: Convert to fraction form
    129.81/195.61 = 107.49/x
  3. Step 3: Cross multiply
    129.81x = 195.61 × 107.49
  4. Step 4: Simplify right side
    129.81x = 21,025.90
  5. Step 5: Solve for x
    x = 21,025.90/129.81
  6. Step 6: Final answer
    x = 161.97

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.