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Finding the Fourth Proportional to 257.28, 355.05 and 198.96

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Solution

The fourth proportional to 257.28, 355.05 and 198.96 is: 274.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.28 : 355.05 = 198.96 : x
  2. Step 2: Convert to fraction form
    257.28/355.05 = 198.96/x
  3. Step 3: Cross multiply
    257.28x = 355.05 × 198.96
  4. Step 4: Simplify right side
    257.28x = 70,640.75
  5. Step 5: Solve for x
    x = 70,640.75/257.28
  6. Step 6: Final answer
    x = 274.57

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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.