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Finding the Fourth Proportional to 139.49, 192.78 and 108.37

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Solution

The fourth proportional to 139.49, 192.78 and 108.37 is: 149.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.49 : 192.78 = 108.37 : x
  2. Step 2: Convert to fraction form
    139.49/192.78 = 108.37/x
  3. Step 3: Cross multiply
    139.49x = 192.78 × 108.37
  4. Step 4: Simplify right side
    139.49x = 20,891.81
  5. Step 5: Solve for x
    x = 20,891.81/139.49
  6. Step 6: Final answer
    x = 149.77

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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.