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Finding the Fourth Proportional to 605,212.80, 907,819.20 and 393,705.60

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Solution

The fourth proportional to 605,212.80, 907,819.20 and 393,705.60 is: 590,558.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    605,212.80 : 907,819.20 = 393,705.60 : x
  2. Step 2: Convert to fraction form
    605,212.80/907,819.20 = 393,705.60/x
  3. Step 3: Cross multiply
    605,212.80x = 907,819.20 × 393,705.60
  4. Step 4: Simplify right side
    605,212.80x = 357,413,502,827.52
  5. Step 5: Solve for x
    x = 357,413,502,827.52/605,212.80
  6. Step 6: Final answer
    x = 590,558.40

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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.