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Finding the Fourth Proportional to 681,136.56, 939,824.64 and 394,639.20

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Solution

The fourth proportional to 681,136.56, 939,824.64 and 394,639.20 is: 544,518.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,136.56 : 939,824.64 = 394,639.20 : x
  2. Step 2: Convert to fraction form
    681,136.56/939,824.64 = 394,639.20/x
  3. Step 3: Cross multiply
    681,136.56x = 939,824.64 × 394,639.20
  4. Step 4: Simplify right side
    681,136.56x = 370,891,644,069.89
  5. Step 5: Solve for x
    x = 370,891,644,069.89/681,136.56
  6. Step 6: Final answer
    x = 544,518.77

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1.5x scale

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.