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Finding the Fourth Proportional to 445.72, 668.63 and 121.09

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Solution

The fourth proportional to 445.72, 668.63 and 121.09 is: 181.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.72 : 668.63 = 121.09 : x
  2. Step 2: Convert to fraction form
    445.72/668.63 = 121.09/x
  3. Step 3: Cross multiply
    445.72x = 668.63 × 121.09
  4. Step 4: Simplify right side
    445.72x = 80,964.41
  5. Step 5: Solve for x
    x = 80,964.41/445.72
  6. Step 6: Final answer
    x = 181.65

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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.