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Finding the Fourth Proportional to 139.26, 192.09 and 102.42

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Solution

The fourth proportional to 139.26, 192.09 and 102.42 is: 141.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.26 : 192.09 = 102.42 : x
  2. Step 2: Convert to fraction form
    139.26/192.09 = 102.42/x
  3. Step 3: Cross multiply
    139.26x = 192.09 × 102.42
  4. Step 4: Simplify right side
    139.26x = 19,673.86
  5. Step 5: Solve for x
    x = 19,673.86/139.26
  6. Step 6: Final answer
    x = 141.27

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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.