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Finding the Fourth Proportional to 139,608.80, 209,413.20 and 83,621.60

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Solution

The fourth proportional to 139,608.80, 209,413.20 and 83,621.60 is: 125,432.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,608.80 : 209,413.20 = 83,621.60 : x
  2. Step 2: Convert to fraction form
    139,608.80/209,413.20 = 83,621.60/x
  3. Step 3: Cross multiply
    139,608.80x = 209,413.20 × 83,621.60
  4. Step 4: Simplify right side
    139,608.80x = 17,511,466,845.12
  5. Step 5: Solve for x
    x = 17,511,466,845.12/139,608.80
  6. Step 6: Final answer
    x = 125,432.40

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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.