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Finding the Fourth Proportional to 620,399.67, 855,933.53 and 405,665.43

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Solution

The fourth proportional to 620,399.67, 855,933.53 and 405,665.43 is: 559,675.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,399.67 : 855,933.53 = 405,665.43 : x
  2. Step 2: Convert to fraction form
    620,399.67/855,933.53 = 405,665.43/x
  3. Step 3: Cross multiply
    620,399.67x = 855,933.53 × 405,665.43
  4. Step 4: Simplify right side
    620,399.67x = 347,222,641,470.54
  5. Step 5: Solve for x
    x = 347,222,641,470.54/620,399.67
  6. Step 6: Final answer
    x = 559,675.74

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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.