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Finding the Fourth Proportional to 256.12, 383.82 and 221.73

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Solution

The fourth proportional to 256.12, 383.82 and 221.73 is: 332.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.12 : 383.82 = 221.73 : x
  2. Step 2: Convert to fraction form
    256.12/383.82 = 221.73/x
  3. Step 3: Cross multiply
    256.12x = 383.82 × 221.73
  4. Step 4: Simplify right side
    256.12x = 85,104.41
  5. Step 5: Solve for x
    x = 85,104.41/256.12
  6. Step 6: Final answer
    x = 332.28

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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.