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Finding the Fourth Proportional to 613,906.80, 920,860.20 and 193,311.60

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Solution

The fourth proportional to 613,906.80, 920,860.20 and 193,311.60 is: 289,967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,906.80 : 920,860.20 = 193,311.60 : x
  2. Step 2: Convert to fraction form
    613,906.80/920,860.20 = 193,311.60/x
  3. Step 3: Cross multiply
    613,906.80x = 920,860.20 × 193,311.60
  4. Step 4: Simplify right side
    613,906.80x = 178,012,958,638.32
  5. Step 5: Solve for x
    x = 178,012,958,638.32/613,906.80
  6. Step 6: Final answer
    x = 289,967.40

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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.