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Finding the Fourth Proportional to 355.43, 490.49 and 198.07

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Solution

The fourth proportional to 355.43, 490.49 and 198.07 is: 273.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.43 : 490.49 = 198.07 : x
  2. Step 2: Convert to fraction form
    355.43/490.49 = 198.07/x
  3. Step 3: Cross multiply
    355.43x = 490.49 × 198.07
  4. Step 4: Simplify right side
    355.43x = 97,150.62
  5. Step 5: Solve for x
    x = 97,150.62/355.43
  6. Step 6: Final answer
    x = 273.34

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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.