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Finding the Fourth Proportional to 12,661,975.80, 18,992,963.70 and 3,686,820.60

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Solution

The fourth proportional to 12,661,975.80, 18,992,963.70 and 3,686,820.60 is: 5,530,230.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661,975.80 : 18,992,963.70 = 3,686,820.60 : x
  2. Step 2: Convert to fraction form
    12,661,975.80/18,992,963.70 = 3,686,820.60/x
  3. Step 3: Cross multiply
    12,661,975.80x = 18,992,963.70 × 3,686,820.60
  4. Step 4: Simplify right side
    12,661,975.80x = 70,023,649,824,212.22
  5. Step 5: Solve for x
    x = 70,023,649,824,212.22/12,661,975.80
  6. Step 6: Final answer
    x = 5,530,230.90

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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.