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Finding the Fourth Proportional to 198.10, 273.09 and 139.78

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Solution

The fourth proportional to 198.10, 273.09 and 139.78 is: 192.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.10 : 273.09 = 139.78 : x
  2. Step 2: Convert to fraction form
    198.10/273.09 = 139.78/x
  3. Step 3: Cross multiply
    198.10x = 273.09 × 139.78
  4. Step 4: Simplify right side
    198.10x = 38,172.52
  5. Step 5: Solve for x
    x = 38,172.52/198.10
  6. Step 6: Final answer
    x = 192.69

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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.