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Finding the Fourth Proportional to 255.32, 381.96 and 221.46

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Solution

The fourth proportional to 255.32, 381.96 and 221.46 is: 331.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.32 : 381.96 = 221.46 : x
  2. Step 2: Convert to fraction form
    255.32/381.96 = 221.46/x
  3. Step 3: Cross multiply
    255.32x = 381.96 × 221.46
  4. Step 4: Simplify right side
    255.32x = 84,588.86
  5. Step 5: Solve for x
    x = 84,588.86/255.32
  6. Step 6: Final answer
    x = 331.31

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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.