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Finding the Fourth Proportional to 18,661,346.40, 27,992,019.60 and 7,890,808.80

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Solution

The fourth proportional to 18,661,346.40, 27,992,019.60 and 7,890,808.80 is: 11,836,213.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661,346.40 : 27,992,019.60 = 7,890,808.80 : x
  2. Step 2: Convert to fraction form
    18,661,346.40/27,992,019.60 = 7,890,808.80/x
  3. Step 3: Cross multiply
    18,661,346.40x = 27,992,019.60 × 7,890,808.80
  4. Step 4: Simplify right side
    18,661,346.40x = 220,879,674,589,452.50
  5. Step 5: Solve for x
    x = 220,879,674,589,452.50/18,661,346.40
  6. Step 6: Final answer
    x = 11,836,213.20

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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.