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Finding the Fourth Proportional to 619,936.80, 929,905.20 and 220,590.60

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Solution

The fourth proportional to 619,936.80, 929,905.20 and 220,590.60 is: 330,885.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,936.80 : 929,905.20 = 220,590.60 : x
  2. Step 2: Convert to fraction form
    619,936.80/929,905.20 = 220,590.60/x
  3. Step 3: Cross multiply
    619,936.80x = 929,905.20 × 220,590.60
  4. Step 4: Simplify right side
    619,936.80x = 205,128,346,011.12
  5. Step 5: Solve for x
    x = 205,128,346,011.12/619,936.80
  6. Step 6: Final answer
    x = 330,885.90

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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.