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Finding the Fourth Proportional to 354.21, 488.79 and 198.96

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Solution

The fourth proportional to 354.21, 488.79 and 198.96 is: 274.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.21 : 488.79 = 198.96 : x
  2. Step 2: Convert to fraction form
    354.21/488.79 = 198.96/x
  3. Step 3: Cross multiply
    354.21x = 488.79 × 198.96
  4. Step 4: Simplify right side
    354.21x = 97,249.66
  5. Step 5: Solve for x
    x = 97,249.66/354.21
  6. Step 6: Final answer
    x = 274.55

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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.