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Finding the Fourth Proportional to 322.40, 445.15 and 198.23

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Solution

The fourth proportional to 322.40, 445.15 and 198.23 is: 273.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.40 : 445.15 = 198.23 : x
  2. Step 2: Convert to fraction form
    322.40/445.15 = 198.23/x
  3. Step 3: Cross multiply
    322.40x = 445.15 × 198.23
  4. Step 4: Simplify right side
    322.40x = 88,242.08
  5. Step 5: Solve for x
    x = 88,242.08/322.40
  6. Step 6: Final answer
    x = 273.70

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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.