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Finding the Fourth Proportional to 139.13, 192.04 and 80.90

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Solution

The fourth proportional to 139.13, 192.04 and 80.90 is: 111.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.13 : 192.04 = 80.90 : x
  2. Step 2: Convert to fraction form
    139.13/192.04 = 80.90/x
  3. Step 3: Cross multiply
    139.13x = 192.04 × 80.90
  4. Step 4: Simplify right side
    139.13x = 15,534.87
  5. Step 5: Solve for x
    x = 15,534.87/139.13
  6. Step 6: Final answer
    x = 111.66

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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.