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Finding the Fourth Proportional to 411,999.20, 617,998.80 and 405,000.80

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Solution

The fourth proportional to 411,999.20, 617,998.80 and 405,000.80 is: 607,501.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,999.20 : 617,998.80 = 405,000.80 : x
  2. Step 2: Convert to fraction form
    411,999.20/617,998.80 = 405,000.80/x
  3. Step 3: Cross multiply
    411,999.20x = 617,998.80 × 405,000.80
  4. Step 4: Simplify right side
    411,999.20x = 250,290,008,399.04
  5. Step 5: Solve for x
    x = 250,290,008,399.04/411,999.20
  6. Step 6: Final answer
    x = 607,501.20

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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.