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Finding the Fourth Proportional to 139.69, 192.56 and 115.09

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Solution

The fourth proportional to 139.69, 192.56 and 115.09 is: 158.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.69 : 192.56 = 115.09 : x
  2. Step 2: Convert to fraction form
    139.69/192.56 = 115.09/x
  3. Step 3: Cross multiply
    139.69x = 192.56 × 115.09
  4. Step 4: Simplify right side
    139.69x = 22,161.73
  5. Step 5: Solve for x
    x = 22,161.73/139.69
  6. Step 6: Final answer
    x = 158.65

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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.