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Finding the Fourth Proportional to 205.94, 284.25 and 128.42

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Solution

The fourth proportional to 205.94, 284.25 and 128.42 is: 177.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.94 : 284.25 = 128.42 : x
  2. Step 2: Convert to fraction form
    205.94/284.25 = 128.42/x
  3. Step 3: Cross multiply
    205.94x = 284.25 × 128.42
  4. Step 4: Simplify right side
    205.94x = 36,503.39
  5. Step 5: Solve for x
    x = 36,503.39/205.94
  6. Step 6: Final answer
    x = 177.25

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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.