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Finding the Fourth Proportional to 408,649,611.20, 612,974,416.80 and 388,494,219.20

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Solution

The fourth proportional to 408,649,611.20, 612,974,416.80 and 388,494,219.20 is: 582,741,328.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,649,611.20 : 612,974,416.80 = 388,494,219.20 : x
  2. Step 2: Convert to fraction form
    408,649,611.20/612,974,416.80 = 388,494,219.20/x
  3. Step 3: Cross multiply
    408,649,611.20x = 612,974,416.80 × 388,494,219.20
  4. Step 4: Simplify right side
    408,649,611.20x = 238,137,017,444,291,328
  5. Step 5: Solve for x
    x = 238,137,017,444,291,328/408,649,611.20
  6. Step 6: Final answer
    x = 582,741,328.80

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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.