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Finding the Fourth Proportional to 445.78, 668.76 and 137.68

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Solution

The fourth proportional to 445.78, 668.76 and 137.68 is: 206.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.78 : 668.76 = 137.68 : x
  2. Step 2: Convert to fraction form
    445.78/668.76 = 137.68/x
  3. Step 3: Cross multiply
    445.78x = 668.76 × 137.68
  4. Step 4: Simplify right side
    445.78x = 92,072.69
  5. Step 5: Solve for x
    x = 92,072.69/445.78
  6. Step 6: Final answer
    x = 206.54

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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.