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Finding the Fourth Proportional to 129.43, 193.22 and 128.15

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Solution

The fourth proportional to 129.43, 193.22 and 128.15 is: 191.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.43 : 193.22 = 128.15 : x
  2. Step 2: Convert to fraction form
    129.43/193.22 = 128.15/x
  3. Step 3: Cross multiply
    129.43x = 193.22 × 128.15
  4. Step 4: Simplify right side
    129.43x = 24,760.74
  5. Step 5: Solve for x
    x = 24,760.74/129.43
  6. Step 6: Final answer
    x = 191.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.