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Finding the Fourth Proportional to 411,115.20, 616,672.80 and 388,305.60

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Solution

The fourth proportional to 411,115.20, 616,672.80 and 388,305.60 is: 582,458.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,115.20 : 616,672.80 = 388,305.60 : x
  2. Step 2: Convert to fraction form
    411,115.20/616,672.80 = 388,305.60/x
  3. Step 3: Cross multiply
    411,115.20x = 616,672.80 × 388,305.60
  4. Step 4: Simplify right side
    411,115.20x = 239,457,501,607.68
  5. Step 5: Solve for x
    x = 239,457,501,607.68/411,115.20
  6. Step 6: Final answer
    x = 582,458.40

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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.