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Finding the Fourth Proportional to 11,788.70, 17,683.60 and 3,891.90

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Solution

The fourth proportional to 11,788.70, 17,683.60 and 3,891.90 is: 5,838.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,788.70 : 17,683.60 = 3,891.90 : x
  2. Step 2: Convert to fraction form
    11,788.70/17,683.60 = 3,891.90/x
  3. Step 3: Cross multiply
    11,788.70x = 17,683.60 × 3,891.90
  4. Step 4: Simplify right side
    11,788.70x = 68,822,802.84
  5. Step 5: Solve for x
    x = 68,822,802.84/11,788.70
  6. Step 6: Final answer
    x = 5,838.03

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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.