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Finding the Fourth Proportional to 272.12, 408.44 and 142.30

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Solution

The fourth proportional to 272.12, 408.44 and 142.30 is: 213.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.12 : 408.44 = 142.30 : x
  2. Step 2: Convert to fraction form
    272.12/408.44 = 142.30/x
  3. Step 3: Cross multiply
    272.12x = 408.44 × 142.30
  4. Step 4: Simplify right side
    272.12x = 58,121.01
  5. Step 5: Solve for x
    x = 58,121.01/272.12
  6. Step 6: Final answer
    x = 213.59

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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.