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Finding the Fourth Proportional to 685,908.87, 946,563.74 and 395,515.36

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Solution

The fourth proportional to 685,908.87, 946,563.74 and 395,515.36 is: 545,816.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,908.87 : 946,563.74 = 395,515.36 : x
  2. Step 2: Convert to fraction form
    685,908.87/946,563.74 = 395,515.36/x
  3. Step 3: Cross multiply
    685,908.87x = 946,563.74 × 395,515.36
  4. Step 4: Simplify right side
    685,908.87x = 374,380,498,389.05
  5. Step 5: Solve for x
    x = 374,380,498,389.05/685,908.87
  6. Step 6: Final answer
    x = 545,816.67

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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.