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Finding the Fourth Proportional to 206.52, 285.04 and 128.88

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Solution

The fourth proportional to 206.52, 285.04 and 128.88 is: 177.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.52 : 285.04 = 128.88 : x
  2. Step 2: Convert to fraction form
    206.52/285.04 = 128.88/x
  3. Step 3: Cross multiply
    206.52x = 285.04 × 128.88
  4. Step 4: Simplify right side
    206.52x = 36,734.53
  5. Step 5: Solve for x
    x = 36,734.53/206.52
  6. Step 6: Final answer
    x = 177.88

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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.