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Finding the Fourth Proportional to 641,207.80, 961,811.70 and 613,905.40

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Solution

The fourth proportional to 641,207.80, 961,811.70 and 613,905.40 is: 920,858.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,207.80 : 961,811.70 = 613,905.40 : x
  2. Step 2: Convert to fraction form
    641,207.80/961,811.70 = 613,905.40/x
  3. Step 3: Cross multiply
    641,207.80x = 961,811.70 × 613,905.40
  4. Step 4: Simplify right side
    641,207.80x = 590,461,396,413.18
  5. Step 5: Solve for x
    x = 590,461,396,413.18/641,207.80
  6. Step 6: Final answer
    x = 920,858.10

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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.