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Finding the Fourth Proportional to 640,868.40, 884,413.52 and 354,394.08

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Solution

The fourth proportional to 640,868.40, 884,413.52 and 354,394.08 is: 489,072.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,868.40 : 884,413.52 = 354,394.08 : x
  2. Step 2: Convert to fraction form
    640,868.40/884,413.52 = 354,394.08/x
  3. Step 3: Cross multiply
    640,868.40x = 884,413.52 × 354,394.08
  4. Step 4: Simplify right side
    640,868.40x = 313,430,915,759.96
  5. Step 5: Solve for x
    x = 313,430,915,759.96/640,868.40
  6. Step 6: Final answer
    x = 489,072.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.