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Finding the Fourth Proportional to 272.30, 408.45 and 211.55

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Solution

The fourth proportional to 272.30, 408.45 and 211.55 is: 317.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.30 : 408.45 = 211.55 : x
  2. Step 2: Convert to fraction form
    272.30/408.45 = 211.55/x
  3. Step 3: Cross multiply
    272.30x = 408.45 × 211.55
  4. Step 4: Simplify right side
    272.30x = 86,407.60
  5. Step 5: Solve for x
    x = 86,407.60/272.30
  6. Step 6: Final answer
    x = 317.33

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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.