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Finding the Fourth Proportional to 272.50, 408.78 and 135.55

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Solution

The fourth proportional to 272.50, 408.78 and 135.55 is: 203.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.50 : 408.78 = 135.55 : x
  2. Step 2: Convert to fraction form
    272.50/408.78 = 135.55/x
  3. Step 3: Cross multiply
    272.50x = 408.78 × 135.55
  4. Step 4: Simplify right side
    272.50x = 55,410.13
  5. Step 5: Solve for x
    x = 55,410.13/272.50
  6. Step 6: Final answer
    x = 203.34

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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.