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Finding the Fourth Proportional to 1,993,978.80, 2,990,968.20 and 1,285,390.80

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Solution

The fourth proportional to 1,993,978.80, 2,990,968.20 and 1,285,390.80 is: 1,928,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993,978.80 : 2,990,968.20 = 1,285,390.80 : x
  2. Step 2: Convert to fraction form
    1,993,978.80/2,990,968.20 = 1,285,390.80/x
  3. Step 3: Cross multiply
    1,993,978.80x = 2,990,968.20 × 1,285,390.80
  4. Step 4: Simplify right side
    1,993,978.80x = 3,844,563,007,372.56
  5. Step 5: Solve for x
    x = 3,844,563,007,372.56/1,993,978.80
  6. Step 6: Final answer
    x = 1,928,086.20

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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.