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Finding the Fourth Proportional to 643,729.20, 965,593.80 and 405,783.60

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Solution

The fourth proportional to 643,729.20, 965,593.80 and 405,783.60 is: 608,675.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,729.20 : 965,593.80 = 405,783.60 : x
  2. Step 2: Convert to fraction form
    643,729.20/965,593.80 = 405,783.60/x
  3. Step 3: Cross multiply
    643,729.20x = 965,593.80 × 405,783.60
  4. Step 4: Simplify right side
    643,729.20x = 391,822,128,301.68
  5. Step 5: Solve for x
    x = 391,822,128,301.68/643,729.20
  6. Step 6: Final answer
    x = 608,675.40

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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.