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Finding the Fourth Proportional to 643,760.40, 965,640.60 and 404,065.20

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Solution

The fourth proportional to 643,760.40, 965,640.60 and 404,065.20 is: 606,097.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,760.40 : 965,640.60 = 404,065.20 : x
  2. Step 2: Convert to fraction form
    643,760.40/965,640.60 = 404,065.20/x
  3. Step 3: Cross multiply
    643,760.40x = 965,640.60 × 404,065.20
  4. Step 4: Simplify right side
    643,760.40x = 390,181,762,167.12
  5. Step 5: Solve for x
    x = 390,181,762,167.12/643,760.40
  6. Step 6: Final answer
    x = 606,097.80

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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.