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Finding the Fourth Proportional to 18,703,846.80, 28,040,218.20 and 7,929,421.20

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Solution

The fourth proportional to 18,703,846.80, 28,040,218.20 and 7,929,421.20 is: 11,887,538.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,703,846.80 : 28,040,218.20 = 7,929,421.20 : x
  2. Step 2: Convert to fraction form
    18,703,846.80/28,040,218.20 = 7,929,421.20/x
  3. Step 3: Cross multiply
    18,703,846.80x = 28,040,218.20 × 7,929,421.20
  4. Step 4: Simplify right side
    18,703,846.80x = 222,342,700,647,705.84
  5. Step 5: Solve for x
    x = 222,342,700,647,705.84/18,703,846.80
  6. Step 6: Final answer
    x = 11,887,538.59

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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.