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Finding the Fourth Proportional to 198.20, 273.36 and 145.72

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Solution

The fourth proportional to 198.20, 273.36 and 145.72 is: 200.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.20 : 273.36 = 145.72 : x
  2. Step 2: Convert to fraction form
    198.20/273.36 = 145.72/x
  3. Step 3: Cross multiply
    198.20x = 273.36 × 145.72
  4. Step 4: Simplify right side
    198.20x = 39,834.02
  5. Step 5: Solve for x
    x = 39,834.02/198.20
  6. Step 6: Final answer
    x = 200.98

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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.