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Finding the Fourth Proportional to 198.20, 273.64 and 139.18

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Solution

The fourth proportional to 198.20, 273.64 and 139.18 is: 192.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.20 : 273.64 = 139.18 : x
  2. Step 2: Convert to fraction form
    198.20/273.64 = 139.18/x
  3. Step 3: Cross multiply
    198.20x = 273.64 × 139.18
  4. Step 4: Simplify right side
    198.20x = 38,085.22
  5. Step 5: Solve for x
    x = 38,085.22/198.20
  6. Step 6: Final answer
    x = 192.16

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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.