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Finding the Fourth Proportional to 198.31, 273.56 and 139.28

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Solution

The fourth proportional to 198.31, 273.56 and 139.28 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.31 : 273.56 = 139.28 : x
  2. Step 2: Convert to fraction form
    198.31/273.56 = 139.28/x
  3. Step 3: Cross multiply
    198.31x = 273.56 × 139.28
  4. Step 4: Simplify right side
    198.31x = 38,100.42
  5. Step 5: Solve for x
    x = 38,100.42/198.31
  6. Step 6: Final answer
    x = 192.12

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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.