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Finding the Fourth Proportional to 355.66, 490.78 and 198.31

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Solution

The fourth proportional to 355.66, 490.78 and 198.31 is: 273.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.66 : 490.78 = 198.31 : x
  2. Step 2: Convert to fraction form
    355.66/490.78 = 198.31/x
  3. Step 3: Cross multiply
    355.66x = 490.78 × 198.31
  4. Step 4: Simplify right side
    355.66x = 97,326.58
  5. Step 5: Solve for x
    x = 97,326.58/355.66
  6. Step 6: Final answer
    x = 273.65

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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.