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Finding the Fourth Proportional to 253.96, 379.26 and 221.56

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Solution

The fourth proportional to 253.96, 379.26 and 221.56 is: 330.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.96 : 379.26 = 221.56 : x
  2. Step 2: Convert to fraction form
    253.96/379.26 = 221.56/x
  3. Step 3: Cross multiply
    253.96x = 379.26 × 221.56
  4. Step 4: Simplify right side
    253.96x = 84,028.85
  5. Step 5: Solve for x
    x = 84,028.85/253.96
  6. Step 6: Final answer
    x = 330.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.