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Finding the Fourth Proportional to 663,123.40, 994,101.90 and 396,989.80

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Solution

The fourth proportional to 663,123.40, 994,101.90 and 396,989.80 is: 595,135.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,123.40 : 994,101.90 = 396,989.80 : x
  2. Step 2: Convert to fraction form
    663,123.40/994,101.90 = 396,989.80/x
  3. Step 3: Cross multiply
    663,123.40x = 994,101.90 × 396,989.80
  4. Step 4: Simplify right side
    663,123.40x = 394,648,314,460.62
  5. Step 5: Solve for x
    x = 394,648,314,460.62/663,123.40
  6. Step 6: Final answer
    x = 595,135.56

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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.