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Finding the Fourth Proportional to 327.78, 452.45 and 211.38

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Solution

The fourth proportional to 327.78, 452.45 and 211.38 is: 291.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.78 : 452.45 = 211.38 : x
  2. Step 2: Convert to fraction form
    327.78/452.45 = 211.38/x
  3. Step 3: Cross multiply
    327.78x = 452.45 × 211.38
  4. Step 4: Simplify right side
    327.78x = 95,638.88
  5. Step 5: Solve for x
    x = 95,638.88/327.78
  6. Step 6: Final answer
    x = 291.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.