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Finding the Fourth Proportional to 1,214,631.90, 1,821,947.85 and 978,435.90

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Solution

The fourth proportional to 1,214,631.90, 1,821,947.85 and 978,435.90 is: 1,467,653.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214,631.90 : 1,821,947.85 = 978,435.90 : x
  2. Step 2: Convert to fraction form
    1,214,631.90/1,821,947.85 = 978,435.90/x
  3. Step 3: Cross multiply
    1,214,631.90x = 1,821,947.85 × 978,435.90
  4. Step 4: Simplify right side
    1,214,631.90x = 1,782,659,184,367.82
  5. Step 5: Solve for x
    x = 1,782,659,184,367.82/1,214,631.90
  6. Step 6: Final answer
    x = 1,467,653.85

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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.