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Finding the Fourth Proportional to 256.17, 353.16 and 197.28

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Solution

The fourth proportional to 256.17, 353.16 and 197.28 is: 271.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.17 : 353.16 = 197.28 : x
  2. Step 2: Convert to fraction form
    256.17/353.16 = 197.28/x
  3. Step 3: Cross multiply
    256.17x = 353.16 × 197.28
  4. Step 4: Simplify right side
    256.17x = 69,671.40
  5. Step 5: Solve for x
    x = 69,671.40/256.17
  6. Step 6: Final answer
    x = 271.97

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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.