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Finding the Fourth Proportional to 353.13, 487.31 and 197.88

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Solution

The fourth proportional to 353.13, 487.31 and 197.88 is: 273.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.13 : 487.31 = 197.88 : x
  2. Step 2: Convert to fraction form
    353.13/487.31 = 197.88/x
  3. Step 3: Cross multiply
    353.13x = 487.31 × 197.88
  4. Step 4: Simplify right side
    353.13x = 96,428.90
  5. Step 5: Solve for x
    x = 96,428.90/353.13
  6. Step 6: Final answer
    x = 273.07

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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.