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Finding the Fourth Proportional to 620,400.86, 855,935.16 and 405,666.62

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Solution

The fourth proportional to 620,400.86, 855,935.16 and 405,666.62 is: 559,677.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,400.86 : 855,935.16 = 405,666.62 : x
  2. Step 2: Convert to fraction form
    620,400.86/855,935.16 = 405,666.62/x
  3. Step 3: Cross multiply
    620,400.86x = 855,935.16 × 405,666.62
  4. Step 4: Simplify right side
    620,400.86x = 347,224,323,296.36
  5. Step 5: Solve for x
    x = 347,224,323,296.36/620,400.86
  6. Step 6: Final answer
    x = 559,677.37

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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.