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Finding the Fourth Proportional to 205.92, 308.10 and 128.88

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Solution

The fourth proportional to 205.92, 308.10 and 128.88 is: 192.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.92 : 308.10 = 128.88 : x
  2. Step 2: Convert to fraction form
    205.92/308.10 = 128.88/x
  3. Step 3: Cross multiply
    205.92x = 308.10 × 128.88
  4. Step 4: Simplify right side
    205.92x = 39,707.93
  5. Step 5: Solve for x
    x = 39,707.93/205.92
  6. Step 6: Final answer
    x = 192.83

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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.