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Finding the Fourth Proportional to 18,379,999.80, 27,578,857.05 and 12,977,016.30

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Solution

The fourth proportional to 18,379,999.80, 27,578,857.05 and 12,977,016.30 is: 19,471,778.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,379,999.80 : 27,578,857.05 = 12,977,016.30 : x
  2. Step 2: Convert to fraction form
    18,379,999.80/27,578,857.05 = 12,977,016.30/x
  3. Step 3: Cross multiply
    18,379,999.80x = 27,578,857.05 × 12,977,016.30
  4. Step 4: Simplify right side
    18,379,999.80x = 357,891,277,473,219.94
  5. Step 5: Solve for x
    x = 357,891,277,473,219.94/18,379,999.80
  6. Step 6: Final answer
    x = 19,471,778.09

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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.