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Finding the Fourth Proportional to 1,990,805.82, 2,984,316.86 and 1,269,121.88

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Solution

The fourth proportional to 1,990,805.82, 2,984,316.86 and 1,269,121.88 is: 1,902,476.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990,805.82 : 2,984,316.86 = 1,269,121.88 : x
  2. Step 2: Convert to fraction form
    1,990,805.82/2,984,316.86 = 1,269,121.88/x
  3. Step 3: Cross multiply
    1,990,805.82x = 2,984,316.86 × 1,269,121.88
  4. Step 4: Simplify right side
    1,990,805.82x = 3,787,461,802,611.70
  5. Step 5: Solve for x
    x = 3,787,461,802,611.70/1,990,805.82
  6. Step 6: Final answer
    x = 1,902,476.76

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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.