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Finding the Fourth Proportional to 256.96, 384.90 and 218.44

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Solution

The fourth proportional to 256.96, 384.90 and 218.44 is: 327.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.96 : 384.90 = 218.44 : x
  2. Step 2: Convert to fraction form
    256.96/384.90 = 218.44/x
  3. Step 3: Cross multiply
    256.96x = 384.90 × 218.44
  4. Step 4: Simplify right side
    256.96x = 84,077.56
  5. Step 5: Solve for x
    x = 84,077.56/256.96
  6. Step 6: Final answer
    x = 327.20

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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.