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Finding the Fourth Proportional to 272.34, 408.42 and 135.45

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Solution

The fourth proportional to 272.34, 408.42 and 135.45 is: 203.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.34 : 408.42 = 135.45 : x
  2. Step 2: Convert to fraction form
    272.34/408.42 = 135.45/x
  3. Step 3: Cross multiply
    272.34x = 408.42 × 135.45
  4. Step 4: Simplify right side
    272.34x = 55,320.49
  5. Step 5: Solve for x
    x = 55,320.49/272.34
  6. Step 6: Final answer
    x = 203.13

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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.