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Finding the Fourth Proportional to 12,311.36, 16,989.36 and 6,722

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Solution

The fourth proportional to 12,311.36, 16,989.36 and 6,722 is: 9,276.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,311.36 : 16,989.36 = 6,722 : x
  2. Step 2: Convert to fraction form
    12,311.36/16,989.36 = 6,722/x
  3. Step 3: Cross multiply
    12,311.36x = 16,989.36 × 6,722
  4. Step 4: Simplify right side
    12,311.36x = 114,202,477.92
  5. Step 5: Solve for x
    x = 114,202,477.92/12,311.36
  6. Step 6: Final answer
    x = 9,276.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.