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Finding the Fourth Proportional to 394,705.75, 544,706.90 and 215,857.75

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Solution

The fourth proportional to 394,705.75, 544,706.90 and 215,857.75 is: 297,890.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,705.75 : 544,706.90 = 215,857.75 : x
  2. Step 2: Convert to fraction form
    394,705.75/544,706.90 = 215,857.75/x
  3. Step 3: Cross multiply
    394,705.75x = 544,706.90 × 215,857.75
  4. Step 4: Simplify right side
    394,705.75x = 117,579,205,843.48
  5. Step 5: Solve for x
    x = 117,579,205,843.48/394,705.75
  6. Step 6: Final answer
    x = 297,890.79

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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.