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Finding the Fourth Proportional to 272.30, 408.30 and 128.03

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Solution

The fourth proportional to 272.30, 408.30 and 128.03 is: 191.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.30 : 408.30 = 128.03 : x
  2. Step 2: Convert to fraction form
    272.30/408.30 = 128.03/x
  3. Step 3: Cross multiply
    272.30x = 408.30 × 128.03
  4. Step 4: Simplify right side
    272.30x = 52,272.61
  5. Step 5: Solve for x
    x = 52,272.61/272.30
  6. Step 6: Final answer
    x = 191.97

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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.