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Finding the Fourth Proportional to 321.55, 443.73 and 197.22

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Solution

The fourth proportional to 321.55, 443.73 and 197.22 is: 272.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.55 : 443.73 = 197.22 : x
  2. Step 2: Convert to fraction form
    321.55/443.73 = 197.22/x
  3. Step 3: Cross multiply
    321.55x = 443.73 × 197.22
  4. Step 4: Simplify right side
    321.55x = 87,512.43
  5. Step 5: Solve for x
    x = 87,512.43/321.55
  6. Step 6: Final answer
    x = 272.16

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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.