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Finding the Fourth Proportional to 139.89, 193.04 and 129.57

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Solution

The fourth proportional to 139.89, 193.04 and 129.57 is: 178.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.89 : 193.04 = 129.57 : x
  2. Step 2: Convert to fraction form
    139.89/193.04 = 129.57/x
  3. Step 3: Cross multiply
    139.89x = 193.04 × 129.57
  4. Step 4: Simplify right side
    139.89x = 25,011.54
  5. Step 5: Solve for x
    x = 25,011.54/139.89
  6. Step 6: Final answer
    x = 178.79

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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.