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Finding the Fourth Proportional to 445.20, 667.82 and 137.05

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Solution

The fourth proportional to 445.20, 667.82 and 137.05 is: 205.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.20 : 667.82 = 137.05 : x
  2. Step 2: Convert to fraction form
    445.20/667.82 = 137.05/x
  3. Step 3: Cross multiply
    445.20x = 667.82 × 137.05
  4. Step 4: Simplify right side
    445.20x = 91,524.05
  5. Step 5: Solve for x
    x = 91,524.05/445.20
  6. Step 6: Final answer
    x = 205.58

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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.