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Finding the Fourth Proportional to 355.90, 491.15 and 198.54

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Solution

The fourth proportional to 355.90, 491.15 and 198.54 is: 273.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.90 : 491.15 = 198.54 : x
  2. Step 2: Convert to fraction form
    355.90/491.15 = 198.54/x
  3. Step 3: Cross multiply
    355.90x = 491.15 × 198.54
  4. Step 4: Simplify right side
    355.90x = 97,512.92
  5. Step 5: Solve for x
    x = 97,512.92/355.90
  6. Step 6: Final answer
    x = 273.99

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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.