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Finding the Fourth Proportional to 3,878,640.68, 5,815,257.78 and 1,718,491.64

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Solution

The fourth proportional to 3,878,640.68, 5,815,257.78 and 1,718,491.64 is: 2,576,539.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878,640.68 : 5,815,257.78 = 1,718,491.64 : x
  2. Step 2: Convert to fraction form
    3,878,640.68/5,815,257.78 = 1,718,491.64/x
  3. Step 3: Cross multiply
    3,878,640.68x = 5,815,257.78 × 1,718,491.64
  4. Step 4: Simplify right side
    3,878,640.68x = 9,993,471,879,374.96
  5. Step 5: Solve for x
    x = 9,993,471,879,374.96/3,878,640.68
  6. Step 6: Final answer
    x = 2,576,539.75

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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.