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Finding the Fourth Proportional to 620,398.86, 855,932.40 and 405,664.62

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Solution

The fourth proportional to 620,398.86, 855,932.40 and 405,664.62 is: 559,674.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,398.86 : 855,932.40 = 405,664.62 : x
  2. Step 2: Convert to fraction form
    620,398.86/855,932.40 = 405,664.62/x
  3. Step 3: Cross multiply
    620,398.86x = 855,932.40 × 405,664.62
  4. Step 4: Simplify right side
    620,398.86x = 347,221,491,791.69
  5. Step 5: Solve for x
    x = 347,221,491,791.69/620,398.86
  6. Step 6: Final answer
    x = 559,674.61

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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.