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Finding the Fourth Proportional to 355.31, 490.49 and 250.48

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Solution

The fourth proportional to 355.31, 490.49 and 250.48 is: 345.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.31 : 490.49 = 250.48 : x
  2. Step 2: Convert to fraction form
    355.31/490.49 = 250.48/x
  3. Step 3: Cross multiply
    355.31x = 490.49 × 250.48
  4. Step 4: Simplify right side
    355.31x = 122,859.79
  5. Step 5: Solve for x
    x = 122,859.79/355.31
  6. Step 6: Final answer
    x = 345.78

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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.