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Finding the Fourth Proportional to 639,016.40, 957,358.20 and 389,406.80

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Solution

The fourth proportional to 639,016.40, 957,358.20 and 389,406.80 is: 583,399.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,016.40 : 957,358.20 = 389,406.80 : x
  2. Step 2: Convert to fraction form
    639,016.40/957,358.20 = 389,406.80/x
  3. Step 3: Cross multiply
    639,016.40x = 957,358.20 × 389,406.80
  4. Step 4: Simplify right side
    639,016.40x = 372,801,793,115.76
  5. Step 5: Solve for x
    x = 372,801,793,115.76/639,016.40
  6. Step 6: Final answer
    x = 583,399.41

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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.