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Finding the Fourth Proportional to 198.64, 273.92 and 139.68

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Solution

The fourth proportional to 198.64, 273.92 and 139.68 is: 192.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.64 : 273.92 = 139.68 : x
  2. Step 2: Convert to fraction form
    198.64/273.92 = 139.68/x
  3. Step 3: Cross multiply
    198.64x = 273.92 × 139.68
  4. Step 4: Simplify right side
    198.64x = 38,261.15
  5. Step 5: Solve for x
    x = 38,261.15/198.64
  6. Step 6: Final answer
    x = 192.62

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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.