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Finding the Fourth Proportional to 139.44, 192.40 and 81.19

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Solution

The fourth proportional to 139.44, 192.40 and 81.19 is: 112.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.44 : 192.40 = 81.19 : x
  2. Step 2: Convert to fraction form
    139.44/192.40 = 81.19/x
  3. Step 3: Cross multiply
    139.44x = 192.40 × 81.19
  4. Step 4: Simplify right side
    139.44x = 15,620.27
  5. Step 5: Solve for x
    x = 15,620.27/139.44
  6. Step 6: Final answer
    x = 112.02

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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.