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Finding the Fourth Proportional to 12,664,838.80, 18,995,800.20 and 3,689,390.80

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Solution

The fourth proportional to 12,664,838.80, 18,995,800.20 and 3,689,390.80 is: 5,533,661.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,664,838.80 : 18,995,800.20 = 3,689,390.80 : x
  2. Step 2: Convert to fraction form
    12,664,838.80/18,995,800.20 = 3,689,390.80/x
  3. Step 3: Cross multiply
    12,664,838.80x = 18,995,800.20 × 3,689,390.80
  4. Step 4: Simplify right side
    12,664,838.80x = 70,082,930,496,518.16
  5. Step 5: Solve for x
    x = 70,082,930,496,518.16/12,664,838.80
  6. Step 6: Final answer
    x = 5,533,661.47

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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.