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Finding the Fourth Proportional to 3,985,661.20, 5,978,491.80 and 1,326,269.20

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Solution

The fourth proportional to 3,985,661.20, 5,978,491.80 and 1,326,269.20 is: 1,989,403.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985,661.20 : 5,978,491.80 = 1,326,269.20 : x
  2. Step 2: Convert to fraction form
    3,985,661.20/5,978,491.80 = 1,326,269.20/x
  3. Step 3: Cross multiply
    3,985,661.20x = 5,978,491.80 × 1,326,269.20
  4. Step 4: Simplify right side
    3,985,661.20x = 7,929,089,536,792.56
  5. Step 5: Solve for x
    x = 7,929,089,536,792.56/3,985,661.20
  6. Step 6: Final answer
    x = 1,989,403.80

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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.