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Finding the Fourth Proportional to 644,347.20, 966,520.80 and 640,410.60

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Solution

The fourth proportional to 644,347.20, 966,520.80 and 640,410.60 is: 960,615.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,347.20 : 966,520.80 = 640,410.60 : x
  2. Step 2: Convert to fraction form
    644,347.20/966,520.80 = 640,410.60/x
  3. Step 3: Cross multiply
    644,347.20x = 966,520.80 × 640,410.60
  4. Step 4: Simplify right side
    644,347.20x = 618,970,165,440.48
  5. Step 5: Solve for x
    x = 618,970,165,440.48/644,347.20
  6. Step 6: Final answer
    x = 960,615.90

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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.