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Finding the Fourth Proportional to 18,821,312.70, 28,231,969.05 and 11,244,378.30

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Solution

The fourth proportional to 18,821,312.70, 28,231,969.05 and 11,244,378.30 is: 16,866,567.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821,312.70 : 28,231,969.05 = 11,244,378.30 : x
  2. Step 2: Convert to fraction form
    18,821,312.70/28,231,969.05 = 11,244,378.30/x
  3. Step 3: Cross multiply
    18,821,312.70x = 28,231,969.05 × 11,244,378.30
  4. Step 4: Simplify right side
    18,821,312.70x = 317,450,940,152,091.62
  5. Step 5: Solve for x
    x = 317,450,940,152,091.62/18,821,312.70
  6. Step 6: Final answer
    x = 16,866,567.45

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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.