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Finding the Fourth Proportional to 8,712.75, 13,068.96 and 2,138.99

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Solution

The fourth proportional to 8,712.75, 13,068.96 and 2,138.99 is: 3,208.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.75 : 13,068.96 = 2,138.99 : x
  2. Step 2: Convert to fraction form
    8,712.75/13,068.96 = 2,138.99/x
  3. Step 3: Cross multiply
    8,712.75x = 13,068.96 × 2,138.99
  4. Step 4: Simplify right side
    8,712.75x = 27,954,309.41
  5. Step 5: Solve for x
    x = 27,954,309.41/8,712.75
  6. Step 6: Final answer
    x = 3,208.44

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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.