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Finding the Fourth Proportional to 1,433,939.44, 1,978,871.16 and 789,380.32

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Solution

The fourth proportional to 1,433,939.44, 1,978,871.16 and 789,380.32 is: 1,089,363.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,433,939.44 : 1,978,871.16 = 789,380.32 : x
  2. Step 2: Convert to fraction form
    1,433,939.44/1,978,871.16 = 789,380.32/x
  3. Step 3: Cross multiply
    1,433,939.44x = 1,978,871.16 × 789,380.32
  4. Step 4: Simplify right side
    1,433,939.44x = 1,562,081,949,519.57
  5. Step 5: Solve for x
    x = 1,562,081,949,519.57/1,433,939.44
  6. Step 6: Final answer
    x = 1,089,363.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.