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Finding the Fourth Proportional to 407,999.20, 611,998.80 and 405,234.40

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Solution

The fourth proportional to 407,999.20, 611,998.80 and 405,234.40 is: 607,851.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,999.20 : 611,998.80 = 405,234.40 : x
  2. Step 2: Convert to fraction form
    407,999.20/611,998.80 = 405,234.40/x
  3. Step 3: Cross multiply
    407,999.20x = 611,998.80 × 405,234.40
  4. Step 4: Simplify right side
    407,999.20x = 248,002,966,518.72
  5. Step 5: Solve for x
    x = 248,002,966,518.72/407,999.20
  6. Step 6: Final answer
    x = 607,851.60

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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.