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Finding the Fourth Proportional to 272.62, 408.57 and 128.08

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Solution

The fourth proportional to 272.62, 408.57 and 128.08 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.62 : 408.57 = 128.08 : x
  2. Step 2: Convert to fraction form
    272.62/408.57 = 128.08/x
  3. Step 3: Cross multiply
    272.62x = 408.57 × 128.08
  4. Step 4: Simplify right side
    272.62x = 52,329.65
  5. Step 5: Solve for x
    x = 52,329.65/272.62
  6. Step 6: Final answer
    x = 191.95

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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.