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Finding the Fourth Proportional to 620,396.41, 855,929.01 and 405,662.17

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Solution

The fourth proportional to 620,396.41, 855,929.01 and 405,662.17 is: 559,671.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,396.41 : 855,929.01 = 405,662.17 : x
  2. Step 2: Convert to fraction form
    620,396.41/855,929.01 = 405,662.17/x
  3. Step 3: Cross multiply
    620,396.41x = 855,929.01 × 405,662.17
  4. Step 4: Simplify right side
    620,396.41x = 347,218,019,562.55
  5. Step 5: Solve for x
    x = 347,218,019,562.55/620,396.41
  6. Step 6: Final answer
    x = 559,671.23

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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.