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Finding the Fourth Proportional to 205.88, 283.96 and 128.12

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Solution

The fourth proportional to 205.88, 283.96 and 128.12 is: 176.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.88 : 283.96 = 128.12 : x
  2. Step 2: Convert to fraction form
    205.88/283.96 = 128.12/x
  3. Step 3: Cross multiply
    205.88x = 283.96 × 128.12
  4. Step 4: Simplify right side
    205.88x = 36,380.96
  5. Step 5: Solve for x
    x = 36,380.96/205.88
  6. Step 6: Final answer
    x = 176.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.