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Finding the Fourth Proportional to 678,793.60, 1,018,190.40 and 647,689.60

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Solution

The fourth proportional to 678,793.60, 1,018,190.40 and 647,689.60 is: 971,534.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,793.60 : 1,018,190.40 = 647,689.60 : x
  2. Step 2: Convert to fraction form
    678,793.60/1,018,190.40 = 647,689.60/x
  3. Step 3: Cross multiply
    678,793.60x = 1,018,190.40 × 647,689.60
  4. Step 4: Simplify right side
    678,793.60x = 659,471,332,899.84
  5. Step 5: Solve for x
    x = 659,471,332,899.84/678,793.60
  6. Step 6: Final answer
    x = 971,534.40

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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.