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Finding the Fourth Proportional to 272.55, 408.79 and 135.45

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Solution

The fourth proportional to 272.55, 408.79 and 135.45 is: 203.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.55 : 408.79 = 135.45 : x
  2. Step 2: Convert to fraction form
    272.55/408.79 = 135.45/x
  3. Step 3: Cross multiply
    272.55x = 408.79 × 135.45
  4. Step 4: Simplify right side
    272.55x = 55,369.93
  5. Step 5: Solve for x
    x = 55,369.93/272.55
  6. Step 6: Final answer
    x = 203.16

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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.