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Finding the Fourth Proportional to 218,413.80, 327,620.70 and 129,621.60

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Solution

The fourth proportional to 218,413.80, 327,620.70 and 129,621.60 is: 194,432.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,413.80 : 327,620.70 = 129,621.60 : x
  2. Step 2: Convert to fraction form
    218,413.80/327,620.70 = 129,621.60/x
  3. Step 3: Cross multiply
    218,413.80x = 327,620.70 × 129,621.60
  4. Step 4: Simplify right side
    218,413.80x = 42,466,719,327.12
  5. Step 5: Solve for x
    x = 42,466,719,327.12/218,413.80
  6. Step 6: Final answer
    x = 194,432.40

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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.