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Finding the Fourth Proportional to 272.11, 408.37 and 218.65

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Solution

The fourth proportional to 272.11, 408.37 and 218.65 is: 328.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.11 : 408.37 = 218.65 : x
  2. Step 2: Convert to fraction form
    272.11/408.37 = 218.65/x
  3. Step 3: Cross multiply
    272.11x = 408.37 × 218.65
  4. Step 4: Simplify right side
    272.11x = 89,289.01
  5. Step 5: Solve for x
    x = 89,289.01/272.11
  6. Step 6: Final answer
    x = 328.14

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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.