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Finding the Fourth Proportional to 272.67, 408.96 and 80.25

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Solution

The fourth proportional to 272.67, 408.96 and 80.25 is: 120.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.67 : 408.96 = 80.25 : x
  2. Step 2: Convert to fraction form
    272.67/408.96 = 80.25/x
  3. Step 3: Cross multiply
    272.67x = 408.96 × 80.25
  4. Step 4: Simplify right side
    272.67x = 32,819.04
  5. Step 5: Solve for x
    x = 32,819.04/272.67
  6. Step 6: Final answer
    x = 120.36

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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.