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Finding the Fourth Proportional to 321.99, 444.20 and 197.64

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Solution

The fourth proportional to 321.99, 444.20 and 197.64 is: 272.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.99 : 444.20 = 197.64 : x
  2. Step 2: Convert to fraction form
    321.99/444.20 = 197.64/x
  3. Step 3: Cross multiply
    321.99x = 444.20 × 197.64
  4. Step 4: Simplify right side
    321.99x = 87,792.18
  5. Step 5: Solve for x
    x = 87,792.18/321.99
  6. Step 6: Final answer
    x = 272.65

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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.