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Finding the Fourth Proportional to 612,928.80, 919,393.20 and 298,000.80

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Solution

The fourth proportional to 612,928.80, 919,393.20 and 298,000.80 is: 447,001.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,928.80 : 919,393.20 = 298,000.80 : x
  2. Step 2: Convert to fraction form
    612,928.80/919,393.20 = 298,000.80/x
  3. Step 3: Cross multiply
    612,928.80x = 919,393.20 × 298,000.80
  4. Step 4: Simplify right side
    612,928.80x = 273,979,909,114.56
  5. Step 5: Solve for x
    x = 273,979,909,114.56/612,928.80
  6. Step 6: Final answer
    x = 447,001.20

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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.