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Finding the Fourth Proportional to 255.72, 353.18 and 198.20

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Solution

The fourth proportional to 255.72, 353.18 and 198.20 is: 273.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.72 : 353.18 = 198.20 : x
  2. Step 2: Convert to fraction form
    255.72/353.18 = 198.20/x
  3. Step 3: Cross multiply
    255.72x = 353.18 × 198.20
  4. Step 4: Simplify right side
    255.72x = 70,000.28
  5. Step 5: Solve for x
    x = 70,000.28/255.72
  6. Step 6: Final answer
    x = 273.74

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.