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Finding the Fourth Proportional to 137.57, 205.94 and 91.76

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Solution

The fourth proportional to 137.57, 205.94 and 91.76 is: 137.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.57 : 205.94 = 91.76 : x
  2. Step 2: Convert to fraction form
    137.57/205.94 = 91.76/x
  3. Step 3: Cross multiply
    137.57x = 205.94 × 91.76
  4. Step 4: Simplify right side
    137.57x = 18,896.25
  5. Step 5: Solve for x
    x = 18,896.25/137.57
  6. Step 6: Final answer
    x = 137.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.