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Finding the Fourth Proportional to 272.75, 409.14 and 80.39

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Solution

The fourth proportional to 272.75, 409.14 and 80.39 is: 120.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.75 : 409.14 = 80.39 : x
  2. Step 2: Convert to fraction form
    272.75/409.14 = 80.39/x
  3. Step 3: Cross multiply
    272.75x = 409.14 × 80.39
  4. Step 4: Simplify right side
    272.75x = 32,890.76
  5. Step 5: Solve for x
    x = 32,890.76/272.75
  6. Step 6: Final answer
    x = 120.59

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.