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Finding the Fourth Proportional to 43,621.20, 65,431.80 and 40,413.60

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Solution

The fourth proportional to 43,621.20, 65,431.80 and 40,413.60 is: 60,620.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,621.20 : 65,431.80 = 40,413.60 : x
  2. Step 2: Convert to fraction form
    43,621.20/65,431.80 = 40,413.60/x
  3. Step 3: Cross multiply
    43,621.20x = 65,431.80 × 40,413.60
  4. Step 4: Simplify right side
    43,621.20x = 2,644,334,592.48
  5. Step 5: Solve for x
    x = 2,644,334,592.48/43,621.20
  6. Step 6: Final answer
    x = 60,620.40

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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.