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Finding the Fourth Proportional to 256.26, 384.40 and 220.42

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Solution

The fourth proportional to 256.26, 384.40 and 220.42 is: 330.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.26 : 384.40 = 220.42 : x
  2. Step 2: Convert to fraction form
    256.26/384.40 = 220.42/x
  3. Step 3: Cross multiply
    256.26x = 384.40 × 220.42
  4. Step 4: Simplify right side
    256.26x = 84,729.45
  5. Step 5: Solve for x
    x = 84,729.45/256.26
  6. Step 6: Final answer
    x = 330.64

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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.