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Finding the Fourth Proportional to 620,401.86, 855,936.54 and 405,667.62

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Solution

The fourth proportional to 620,401.86, 855,936.54 and 405,667.62 is: 559,678.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,401.86 : 855,936.54 = 405,667.62 : x
  2. Step 2: Convert to fraction form
    620,401.86/855,936.54 = 405,667.62/x
  3. Step 3: Cross multiply
    620,401.86x = 855,936.54 × 405,667.62
  4. Step 4: Simplify right side
    620,401.86x = 347,225,739,052.84
  5. Step 5: Solve for x
    x = 347,225,739,052.84/620,401.86
  6. Step 6: Final answer
    x = 559,678.75

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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.