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Finding the Fourth Proportional to 18,661,348.40, 27,992,022.60 and 7,890,810.80

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Solution

The fourth proportional to 18,661,348.40, 27,992,022.60 and 7,890,810.80 is: 11,836,216.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661,348.40 : 27,992,022.60 = 7,890,810.80 : x
  2. Step 2: Convert to fraction form
    18,661,348.40/27,992,022.60 = 7,890,810.80/x
  3. Step 3: Cross multiply
    18,661,348.40x = 27,992,022.60 × 7,890,810.80
  4. Step 4: Simplify right side
    18,661,348.40x = 220,879,754,245,924.09
  5. Step 5: Solve for x
    x = 220,879,754,245,924.09/18,661,348.40
  6. Step 6: Final answer
    x = 11,836,216.20

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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.