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Finding the Fourth Proportional to 272.72, 408.75 and 135.47

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Solution

The fourth proportional to 272.72, 408.75 and 135.47 is: 203.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.72 : 408.75 = 135.47 : x
  2. Step 2: Convert to fraction form
    272.72/408.75 = 135.47/x
  3. Step 3: Cross multiply
    272.72x = 408.75 × 135.47
  4. Step 4: Simplify right side
    272.72x = 55,373.88
  5. Step 5: Solve for x
    x = 55,373.88/272.72
  6. Step 6: Final answer
    x = 203.05

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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.