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Finding the Fourth Proportional to 198.02, 273.18 and 139.70

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Solution

The fourth proportional to 198.02, 273.18 and 139.70 is: 192.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.02 : 273.18 = 139.70 : x
  2. Step 2: Convert to fraction form
    198.02/273.18 = 139.70/x
  3. Step 3: Cross multiply
    198.02x = 273.18 × 139.70
  4. Step 4: Simplify right side
    198.02x = 38,163.25
  5. Step 5: Solve for x
    x = 38,163.25/198.02
  6. Step 6: Final answer
    x = 192.72

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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.