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Finding the Fourth Proportional to 129.32, 194.86 and 106.99

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Solution

The fourth proportional to 129.32, 194.86 and 106.99 is: 161.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.32 : 194.86 = 106.99 : x
  2. Step 2: Convert to fraction form
    129.32/194.86 = 106.99/x
  3. Step 3: Cross multiply
    129.32x = 194.86 × 106.99
  4. Step 4: Simplify right side
    129.32x = 20,847.54
  5. Step 5: Solve for x
    x = 20,847.54/129.32
  6. Step 6: Final answer
    x = 161.22

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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.