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Finding the Fourth Proportional to 205.24, 308.10 and 128.38

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Solution

The fourth proportional to 205.24, 308.10 and 128.38 is: 192.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.24 : 308.10 = 128.38 : x
  2. Step 2: Convert to fraction form
    205.24/308.10 = 128.38/x
  3. Step 3: Cross multiply
    205.24x = 308.10 × 128.38
  4. Step 4: Simplify right side
    205.24x = 39,553.88
  5. Step 5: Solve for x
    x = 39,553.88/205.24
  6. Step 6: Final answer
    x = 192.72

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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.