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Finding the Fourth Proportional to 8,626.71, 12,936.81 and 2,781.75

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Solution

The fourth proportional to 8,626.71, 12,936.81 and 2,781.75 is: 4,171.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,626.71 : 12,936.81 = 2,781.75 : x
  2. Step 2: Convert to fraction form
    8,626.71/12,936.81 = 2,781.75/x
  3. Step 3: Cross multiply
    8,626.71x = 12,936.81 × 2,781.75
  4. Step 4: Simplify right side
    8,626.71x = 35,986,971.22
  5. Step 5: Solve for x
    x = 35,986,971.22/8,626.71
  6. Step 6: Final answer
    x = 4,171.58

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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.