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Finding the Fourth Proportional to 218,964.20, 328,413.90 and 61,208.60

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Solution

The fourth proportional to 218,964.20, 328,413.90 and 61,208.60 is: 91,803.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,964.20 : 328,413.90 = 61,208.60 : x
  2. Step 2: Convert to fraction form
    218,964.20/328,413.90 = 61,208.60/x
  3. Step 3: Cross multiply
    218,964.20x = 328,413.90 × 61,208.60
  4. Step 4: Simplify right side
    218,964.20x = 20,101,755,039.54
  5. Step 5: Solve for x
    x = 20,101,755,039.54/218,964.20
  6. Step 6: Final answer
    x = 91,803.84

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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.