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Finding the Fourth Proportional to 256.15, 353.49 and 142.59

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Solution

The fourth proportional to 256.15, 353.49 and 142.59 is: 196.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.15 : 353.49 = 142.59 : x
  2. Step 2: Convert to fraction form
    256.15/353.49 = 142.59/x
  3. Step 3: Cross multiply
    256.15x = 353.49 × 142.59
  4. Step 4: Simplify right side
    256.15x = 50,404.93
  5. Step 5: Solve for x
    x = 50,404.93/256.15
  6. Step 6: Final answer
    x = 196.78

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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.