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Finding the Fourth Proportional to 809,205.60, 1,212,771.60 and 720,040.80

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Solution

The fourth proportional to 809,205.60, 1,212,771.60 and 720,040.80 is: 1,079,138.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,205.60 : 1,212,771.60 = 720,040.80 : x
  2. Step 2: Convert to fraction form
    809,205.60/1,212,771.60 = 720,040.80/x
  3. Step 3: Cross multiply
    809,205.60x = 1,212,771.60 × 720,040.80
  4. Step 4: Simplify right side
    809,205.60x = 873,245,033,081.28
  5. Step 5: Solve for x
    x = 873,245,033,081.28/809,205.60
  6. Step 6: Final answer
    x = 1,079,138.64

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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.