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Finding the Fourth Proportional to 445.84, 668.79 and 121.21

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Solution

The fourth proportional to 445.84, 668.79 and 121.21 is: 181.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.84 : 668.79 = 121.21 : x
  2. Step 2: Convert to fraction form
    445.84/668.79 = 121.21/x
  3. Step 3: Cross multiply
    445.84x = 668.79 × 121.21
  4. Step 4: Simplify right side
    445.84x = 81,060.69
  5. Step 5: Solve for x
    x = 81,060.69/445.84
  6. Step 6: Final answer
    x = 181.82

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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.