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Finding the Fourth Proportional to 137.92, 190.32 and 86.08

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Solution

The fourth proportional to 137.92, 190.32 and 86.08 is: 118.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.92 : 190.32 = 86.08 : x
  2. Step 2: Convert to fraction form
    137.92/190.32 = 86.08/x
  3. Step 3: Cross multiply
    137.92x = 190.32 × 86.08
  4. Step 4: Simplify right side
    137.92x = 16,382.75
  5. Step 5: Solve for x
    x = 16,382.75/137.92
  6. Step 6: Final answer
    x = 118.78

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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.