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Finding the Fourth Proportional to 139.36, 192.33 and 77.21

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Solution

The fourth proportional to 139.36, 192.33 and 77.21 is: 106.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.36 : 192.33 = 77.21 : x
  2. Step 2: Convert to fraction form
    139.36/192.33 = 77.21/x
  3. Step 3: Cross multiply
    139.36x = 192.33 × 77.21
  4. Step 4: Simplify right side
    139.36x = 14,850.93
  5. Step 5: Solve for x
    x = 14,850.93/139.36
  6. Step 6: Final answer
    x = 106.56

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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.