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Finding the Fourth Proportional to 137.96, 190.14 and 129.72

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Solution

The fourth proportional to 137.96, 190.14 and 129.72 is: 178.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.96 : 190.14 = 129.72 : x
  2. Step 2: Convert to fraction form
    137.96/190.14 = 129.72/x
  3. Step 3: Cross multiply
    137.96x = 190.14 × 129.72
  4. Step 4: Simplify right side
    137.96x = 24,664.96
  5. Step 5: Solve for x
    x = 24,664.96/137.96
  6. Step 6: Final answer
    x = 178.78

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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.