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Finding the Fourth Proportional to 272.28, 408.69 and 221.52

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Solution

The fourth proportional to 272.28, 408.69 and 221.52 is: 332.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.28 : 408.69 = 221.52 : x
  2. Step 2: Convert to fraction form
    272.28/408.69 = 221.52/x
  3. Step 3: Cross multiply
    272.28x = 408.69 × 221.52
  4. Step 4: Simplify right side
    272.28x = 90,533.01
  5. Step 5: Solve for x
    x = 90,533.01/272.28
  6. Step 6: Final answer
    x = 332.50

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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.