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Finding the Fourth Proportional to 257.20, 354.78 and 169.90

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Solution

The fourth proportional to 257.20, 354.78 and 169.90 is: 234.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.20 : 354.78 = 169.90 : x
  2. Step 2: Convert to fraction form
    257.20/354.78 = 169.90/x
  3. Step 3: Cross multiply
    257.20x = 354.78 × 169.90
  4. Step 4: Simplify right side
    257.20x = 60,277.12
  5. Step 5: Solve for x
    x = 60,277.12/257.20
  6. Step 6: Final answer
    x = 234.36

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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.