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Finding the Fourth Proportional to 641,212.80, 961,819.20 and 613,910.40

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Solution

The fourth proportional to 641,212.80, 961,819.20 and 613,910.40 is: 920,865.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,212.80 : 961,819.20 = 613,910.40 : x
  2. Step 2: Convert to fraction form
    641,212.80/961,819.20 = 613,910.40/x
  3. Step 3: Cross multiply
    641,212.80x = 961,819.20 × 613,910.40
  4. Step 4: Simplify right side
    641,212.80x = 590,470,809,799.68
  5. Step 5: Solve for x
    x = 590,470,809,799.68/641,212.80
  6. Step 6: Final answer
    x = 920,865.60

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Half scale
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Double scale
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Similar ratio
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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.