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Finding the Fourth Proportional to 539,557.80, 809,336.70 and 439,830.60

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Solution

The fourth proportional to 539,557.80, 809,336.70 and 439,830.60 is: 659,745.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,557.80 : 809,336.70 = 439,830.60 : x
  2. Step 2: Convert to fraction form
    539,557.80/809,336.70 = 439,830.60/x
  3. Step 3: Cross multiply
    539,557.80x = 809,336.70 × 439,830.60
  4. Step 4: Simplify right side
    539,557.80x = 355,971,046,363.02
  5. Step 5: Solve for x
    x = 355,971,046,363.02/539,557.80
  6. Step 6: Final answer
    x = 659,745.90

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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.