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Finding the Fourth Proportional to 137.96, 190.25 and 91.31

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Solution

The fourth proportional to 137.96, 190.25 and 91.31 is: 125.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.96 : 190.25 = 91.31 : x
  2. Step 2: Convert to fraction form
    137.96/190.25 = 91.31/x
  3. Step 3: Cross multiply
    137.96x = 190.25 × 91.31
  4. Step 4: Simplify right side
    137.96x = 17,370.32
  5. Step 5: Solve for x
    x = 17,370.32/137.96
  6. Step 6: Final answer
    x = 125.91

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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.