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Finding the Fourth Proportional to 445.75, 668.66 and 137.65

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Solution

The fourth proportional to 445.75, 668.66 and 137.65 is: 206.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.75 : 668.66 = 137.65 : x
  2. Step 2: Convert to fraction form
    445.75/668.66 = 137.65/x
  3. Step 3: Cross multiply
    445.75x = 668.66 × 137.65
  4. Step 4: Simplify right side
    445.75x = 92,039.94
  5. Step 5: Solve for x
    x = 92,039.94/445.75
  6. Step 6: Final answer
    x = 206.48

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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.