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Finding the Fourth Proportional to 405,945.60, 608,918.40 and 389,356.80

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Solution

The fourth proportional to 405,945.60, 608,918.40 and 389,356.80 is: 584,035.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,945.60 : 608,918.40 = 389,356.80 : x
  2. Step 2: Convert to fraction form
    405,945.60/608,918.40 = 389,356.80/x
  3. Step 3: Cross multiply
    405,945.60x = 608,918.40 × 389,356.80
  4. Step 4: Simplify right side
    405,945.60x = 237,086,519,685.12
  5. Step 5: Solve for x
    x = 237,086,519,685.12/405,945.60
  6. Step 6: Final answer
    x = 584,035.20

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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.