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Finding the Fourth Proportional to 18,678,936.80, 28,039,400.40 and 14,437,906.40

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Solution

The fourth proportional to 18,678,936.80, 28,039,400.40 and 14,437,906.40 is: 21,673,087.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,678,936.80 : 28,039,400.40 = 14,437,906.40 : x
  2. Step 2: Convert to fraction form
    18,678,936.80/28,039,400.40 = 14,437,906.40/x
  3. Step 3: Cross multiply
    18,678,936.80x = 28,039,400.40 × 14,437,906.40
  4. Step 4: Simplify right side
    18,678,936.80x = 404,830,238,487,322.56
  5. Step 5: Solve for x
    x = 404,830,238,487,322.56/18,678,936.80
  6. Step 6: Final answer
    x = 21,673,087.86

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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.