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Finding the Fourth Proportional to 620,395.92, 855,928.34 and 405,661.68

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Solution

The fourth proportional to 620,395.92, 855,928.34 and 405,661.68 is: 559,670.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,395.92 : 855,928.34 = 405,661.68 : x
  2. Step 2: Convert to fraction form
    620,395.92/855,928.34 = 405,661.68/x
  3. Step 3: Cross multiply
    620,395.92x = 855,928.34 × 405,661.68
  4. Step 4: Simplify right side
    620,395.92x = 347,217,328,364.01
  5. Step 5: Solve for x
    x = 347,217,328,364.01/620,395.92
  6. Step 6: Final answer
    x = 559,670.55

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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.