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Finding the Fourth Proportional to 619,883.40, 929,825.10 and 419,116.80

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Solution

The fourth proportional to 619,883.40, 929,825.10 and 419,116.80 is: 628,675.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,883.40 : 929,825.10 = 419,116.80 : x
  2. Step 2: Convert to fraction form
    619,883.40/929,825.10 = 419,116.80/x
  3. Step 3: Cross multiply
    619,883.40x = 929,825.10 × 419,116.80
  4. Step 4: Simplify right side
    619,883.40x = 389,705,320,471.68
  5. Step 5: Solve for x
    x = 389,705,320,471.68/619,883.40
  6. Step 6: Final answer
    x = 628,675.20

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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.