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Finding the Fourth Proportional to 129.92, 193.94 and 128.24

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Solution

The fourth proportional to 129.92, 193.94 and 128.24 is: 191.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.92 : 193.94 = 128.24 : x
  2. Step 2: Convert to fraction form
    129.92/193.94 = 128.24/x
  3. Step 3: Cross multiply
    129.92x = 193.94 × 128.24
  4. Step 4: Simplify right side
    129.92x = 24,870.87
  5. Step 5: Solve for x
    x = 24,870.87/129.92
  6. Step 6: Final answer
    x = 191.43

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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.