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Finding the Fourth Proportional to 445.75, 668.61 and 121.12

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Solution

The fourth proportional to 445.75, 668.61 and 121.12 is: 181.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.75 : 668.61 = 121.12 : x
  2. Step 2: Convert to fraction form
    445.75/668.61 = 121.12/x
  3. Step 3: Cross multiply
    445.75x = 668.61 × 121.12
  4. Step 4: Simplify right side
    445.75x = 80,982.04
  5. Step 5: Solve for x
    x = 80,982.04/445.75
  6. Step 6: Final answer
    x = 181.68

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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.