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Finding the Fourth Proportional to 217,908.21, 300,680.60 and 122,396.61

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Solution

The fourth proportional to 217,908.21, 300,680.60 and 122,396.61 is: 168,888.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,908.21 : 300,680.60 = 122,396.61 : x
  2. Step 2: Convert to fraction form
    217,908.21/300,680.60 = 122,396.61/x
  3. Step 3: Cross multiply
    217,908.21x = 300,680.60 × 122,396.61
  4. Step 4: Simplify right side
    217,908.21x = 36,802,285,520.78
  5. Step 5: Solve for x
    x = 36,802,285,520.78/217,908.21
  6. Step 6: Final answer
    x = 168,888.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.