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Finding the Fourth Proportional to 137.45, 205.66 and 91.91

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Solution

The fourth proportional to 137.45, 205.66 and 91.91 is: 137.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.45 : 205.66 = 91.91 : x
  2. Step 2: Convert to fraction form
    137.45/205.66 = 91.91/x
  3. Step 3: Cross multiply
    137.45x = 205.66 × 91.91
  4. Step 4: Simplify right side
    137.45x = 18,902.21
  5. Step 5: Solve for x
    x = 18,902.21/137.45
  6. Step 6: Final answer
    x = 137.52

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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.