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Finding the Fourth Proportional to 445.91, 668.90 and 137.78

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Solution

The fourth proportional to 445.91, 668.90 and 137.78 is: 206.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.91 : 668.90 = 137.78 : x
  2. Step 2: Convert to fraction form
    445.91/668.90 = 137.78/x
  3. Step 3: Cross multiply
    445.91x = 668.90 × 137.78
  4. Step 4: Simplify right side
    445.91x = 92,161.04
  5. Step 5: Solve for x
    x = 92,161.04/445.91
  6. Step 6: Final answer
    x = 206.68

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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.