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Finding the Fourth Proportional to 272.40, 408.78 and 135.56

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Solution

The fourth proportional to 272.40, 408.78 and 135.56 is: 203.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.40 : 408.78 = 135.56 : x
  2. Step 2: Convert to fraction form
    272.40/408.78 = 135.56/x
  3. Step 3: Cross multiply
    272.40x = 408.78 × 135.56
  4. Step 4: Simplify right side
    272.40x = 55,414.22
  5. Step 5: Solve for x
    x = 55,414.22/272.40
  6. Step 6: Final answer
    x = 203.43

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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.