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Finding the Fourth Proportional to 272.72, 409.13 and 80.35

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Solution

The fourth proportional to 272.72, 409.13 and 80.35 is: 120.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.72 : 409.13 = 80.35 : x
  2. Step 2: Convert to fraction form
    272.72/409.13 = 80.35/x
  3. Step 3: Cross multiply
    272.72x = 409.13 × 80.35
  4. Step 4: Simplify right side
    272.72x = 32,873.60
  5. Step 5: Solve for x
    x = 32,873.60/272.72
  6. Step 6: Final answer
    x = 120.54

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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.