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Finding the Fourth Proportional to 394,107, 543,869.82 and 215,259

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Solution

The fourth proportional to 394,107, 543,869.82 and 215,259 is: 297,058.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,107 : 543,869.82 = 215,259 : x
  2. Step 2: Convert to fraction form
    394,107/543,869.82 = 215,259/x
  3. Step 3: Cross multiply
    394,107x = 543,869.82 × 215,259
  4. Step 4: Simplify right side
    394,107x = 117,072,873,583.38
  5. Step 5: Solve for x
    x = 117,072,873,583.38/394,107
  6. Step 6: Final answer
    x = 297,058.60

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1.5x scale

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.