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Finding the Fourth Proportional to 321.90, 443.99 and 197.63

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Solution

The fourth proportional to 321.90, 443.99 and 197.63 is: 272.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.90 : 443.99 = 197.63 : x
  2. Step 2: Convert to fraction form
    321.90/443.99 = 197.63/x
  3. Step 3: Cross multiply
    321.90x = 443.99 × 197.63
  4. Step 4: Simplify right side
    321.90x = 87,747.21
  5. Step 5: Solve for x
    x = 87,747.21/321.90
  6. Step 6: Final answer
    x = 272.59

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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.