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Finding the Fourth Proportional to 353.46, 487.76 and 198.21

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Solution

The fourth proportional to 353.46, 487.76 and 198.21 is: 273.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.46 : 487.76 = 198.21 : x
  2. Step 2: Convert to fraction form
    353.46/487.76 = 198.21/x
  3. Step 3: Cross multiply
    353.46x = 487.76 × 198.21
  4. Step 4: Simplify right side
    353.46x = 96,679.41
  5. Step 5: Solve for x
    x = 96,679.41/353.46
  6. Step 6: Final answer
    x = 273.52

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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.