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Finding the Fourth Proportional to 322.71, 445.40 and 198.45

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Solution

The fourth proportional to 322.71, 445.40 and 198.45 is: 273.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.71 : 445.40 = 198.45 : x
  2. Step 2: Convert to fraction form
    322.71/445.40 = 198.45/x
  3. Step 3: Cross multiply
    322.71x = 445.40 × 198.45
  4. Step 4: Simplify right side
    322.71x = 88,389.63
  5. Step 5: Solve for x
    x = 88,389.63/322.71
  6. Step 6: Final answer
    x = 273.90

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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.