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Finding the Fourth Proportional to 136.85, 205.31 and 91.37

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Solution

The fourth proportional to 136.85, 205.31 and 91.37 is: 137.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.85 : 205.31 = 91.37 : x
  2. Step 2: Convert to fraction form
    136.85/205.31 = 91.37/x
  3. Step 3: Cross multiply
    136.85x = 205.31 × 91.37
  4. Step 4: Simplify right side
    136.85x = 18,759.92
  5. Step 5: Solve for x
    x = 18,759.92/136.85
  6. Step 6: Final answer
    x = 137.09

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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.