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Finding the Fourth Proportional to 640,190.75, 883,481.06 and 353,729.30

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Solution

The fourth proportional to 640,190.75, 883,481.06 and 353,729.30 is: 488,156.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,190.75 : 883,481.06 = 353,729.30 : x
  2. Step 2: Convert to fraction form
    640,190.75/883,481.06 = 353,729.30/x
  3. Step 3: Cross multiply
    640,190.75x = 883,481.06 × 353,729.30
  4. Step 4: Simplify right side
    640,190.75x = 312,513,140,010.08
  5. Step 5: Solve for x
    x = 312,513,140,010.08/640,190.75
  6. Step 6: Final answer
    x = 488,156.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.