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Finding the Fourth Proportional to 640,940.20, 961,410.30 and 628,498.60

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Solution

The fourth proportional to 640,940.20, 961,410.30 and 628,498.60 is: 942,747.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,940.20 : 961,410.30 = 628,498.60 : x
  2. Step 2: Convert to fraction form
    640,940.20/961,410.30 = 628,498.60/x
  3. Step 3: Cross multiply
    640,940.20x = 961,410.30 × 628,498.60
  4. Step 4: Simplify right side
    640,940.20x = 604,245,027,575.58
  5. Step 5: Solve for x
    x = 604,245,027,575.58/640,940.20
  6. Step 6: Final answer
    x = 942,747.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.