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Finding the Fourth Proportional to 8,618.88, 12,918.08 and 3,992

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Solution

The fourth proportional to 8,618.88, 12,918.08 and 3,992 is: 5,983.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,618.88 : 12,918.08 = 3,992 : x
  2. Step 2: Convert to fraction form
    8,618.88/12,918.08 = 3,992/x
  3. Step 3: Cross multiply
    8,618.88x = 12,918.08 × 3,992
  4. Step 4: Simplify right side
    8,618.88x = 51,568,975.36
  5. Step 5: Solve for x
    x = 51,568,975.36/8,618.88
  6. Step 6: Final answer
    x = 5,983.26

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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.