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Finding the Fourth Proportional to 2,619,135.42, 3,928,751.73 and 821,978.70

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Solution

The fourth proportional to 2,619,135.42, 3,928,751.73 and 821,978.70 is: 1,232,983.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619,135.42 : 3,928,751.73 = 821,978.70 : x
  2. Step 2: Convert to fraction form
    2,619,135.42/3,928,751.73 = 821,978.70/x
  3. Step 3: Cross multiply
    2,619,135.42x = 3,928,751.73 × 821,978.70
  4. Step 4: Simplify right side
    2,619,135.42x = 3,229,350,239,648.15
  5. Step 5: Solve for x
    x = 3,229,350,239,648.15/2,619,135.42
  6. Step 6: Final answer
    x = 1,232,983.30

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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.