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Finding the Fourth Proportional to 139.29, 192.24 and 102.39

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Solution

The fourth proportional to 139.29, 192.24 and 102.39 is: 141.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.29 : 192.24 = 102.39 : x
  2. Step 2: Convert to fraction form
    139.29/192.24 = 102.39/x
  3. Step 3: Cross multiply
    139.29x = 192.24 × 102.39
  4. Step 4: Simplify right side
    139.29x = 19,683.45
  5. Step 5: Solve for x
    x = 19,683.45/139.29
  6. Step 6: Final answer
    x = 141.31

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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.