Home / 81,978,121.20-122,967,181.80-21,393,847.20

Finding the Fourth Proportional to 81,978,121.20, 122,967,181.80 and 21,393,847.20

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Solution

The fourth proportional to 81,978,121.20, 122,967,181.80 and 21,393,847.20 is: 32,090,770.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,978,121.20 : 122,967,181.80 = 21,393,847.20 : x
  2. Step 2: Convert to fraction form
    81,978,121.20/122,967,181.80 = 21,393,847.20/x
  3. Step 3: Cross multiply
    81,978,121.20x = 122,967,181.80 × 21,393,847.20
  4. Step 4: Simplify right side
    81,978,121.20x = 2,630,741,098,043,821
  5. Step 5: Solve for x
    x = 2,630,741,098,043,821/81,978,121.20
  6. Step 6: Final answer
    x = 32,090,770.80

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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.