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Finding the Fourth Proportional to 139.44, 192.43 and 80.43

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Solution

The fourth proportional to 139.44, 192.43 and 80.43 is: 111.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.44 : 192.43 = 80.43 : x
  2. Step 2: Convert to fraction form
    139.44/192.43 = 80.43/x
  3. Step 3: Cross multiply
    139.44x = 192.43 × 80.43
  4. Step 4: Simplify right side
    139.44x = 15,477.14
  5. Step 5: Solve for x
    x = 15,477.14/139.44
  6. Step 6: Final answer
    x = 111.00

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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.