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Finding the Fourth Proportional to 267.96, 369.80 and 221.31

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Solution

The fourth proportional to 267.96, 369.80 and 221.31 is: 305.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    267.96 : 369.80 = 221.31 : x
  2. Step 2: Convert to fraction form
    267.96/369.80 = 221.31/x
  3. Step 3: Cross multiply
    267.96x = 369.80 × 221.31
  4. Step 4: Simplify right side
    267.96x = 81,839.33
  5. Step 5: Solve for x
    x = 81,839.33/267.96
  6. Step 6: Final answer
    x = 305.42

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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.