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Finding the Fourth Proportional to 257.10, 354.89 and 197.97

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Solution

The fourth proportional to 257.10, 354.89 and 197.97 is: 273.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.10 : 354.89 = 197.97 : x
  2. Step 2: Convert to fraction form
    257.10/354.89 = 197.97/x
  3. Step 3: Cross multiply
    257.10x = 354.89 × 197.97
  4. Step 4: Simplify right side
    257.10x = 70,258.07
  5. Step 5: Solve for x
    x = 70,258.07/257.10
  6. Step 6: Final answer
    x = 273.27

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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.