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Finding the Fourth Proportional to 257.31, 355.10 and 191.97

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Solution

The fourth proportional to 257.31, 355.10 and 191.97 is: 264.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.31 : 355.10 = 191.97 : x
  2. Step 2: Convert to fraction form
    257.31/355.10 = 191.97/x
  3. Step 3: Cross multiply
    257.31x = 355.10 × 191.97
  4. Step 4: Simplify right side
    257.31x = 68,167.59
  5. Step 5: Solve for x
    x = 68,167.59/257.31
  6. Step 6: Final answer
    x = 264.92

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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.