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Finding the Fourth Proportional to 7,879,916.80, 11,810,689.80 and 3,620,515.60

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Solution

The fourth proportional to 7,879,916.80, 11,810,689.80 and 3,620,515.60 is: 5,426,553.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,879,916.80 : 11,810,689.80 = 3,620,515.60 : x
  2. Step 2: Convert to fraction form
    7,879,916.80/11,810,689.80 = 3,620,515.60/x
  3. Step 3: Cross multiply
    7,879,916.80x = 11,810,689.80 × 3,620,515.60
  4. Step 4: Simplify right side
    7,879,916.80x = 42,760,786,667,660.88
  5. Step 5: Solve for x
    x = 42,760,786,667,660.88/7,879,916.80
  6. Step 6: Final answer
    x = 5,426,553.07

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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.