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Finding the Fourth Proportional to 405,998.80, 608,998.20 and 389,669.20

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Solution

The fourth proportional to 405,998.80, 608,998.20 and 389,669.20 is: 584,503.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,998.80 : 608,998.20 = 389,669.20 : x
  2. Step 2: Convert to fraction form
    405,998.80/608,998.20 = 389,669.20/x
  3. Step 3: Cross multiply
    405,998.80x = 608,998.20 × 389,669.20
  4. Step 4: Simplify right side
    405,998.80x = 237,307,841,395.44
  5. Step 5: Solve for x
    x = 237,307,841,395.44/405,998.80
  6. Step 6: Final answer
    x = 584,503.80

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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.