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Finding the Fourth Proportional to 256.19, 352.80 and 255.38

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Solution

The fourth proportional to 256.19, 352.80 and 255.38 is: 351.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.19 : 352.80 = 255.38 : x
  2. Step 2: Convert to fraction form
    256.19/352.80 = 255.38/x
  3. Step 3: Cross multiply
    256.19x = 352.80 × 255.38
  4. Step 4: Simplify right side
    256.19x = 90,096.30
  5. Step 5: Solve for x
    x = 90,096.30/256.19
  6. Step 6: Final answer
    x = 351.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.