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Finding the Fourth Proportional to 12,121.88, 16,728.08 and 6,816.58

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Solution

The fourth proportional to 12,121.88, 16,728.08 and 6,816.58 is: 9,406.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.88 : 16,728.08 = 6,816.58 : x
  2. Step 2: Convert to fraction form
    12,121.88/16,728.08 = 6,816.58/x
  3. Step 3: Cross multiply
    12,121.88x = 16,728.08 × 6,816.58
  4. Step 4: Simplify right side
    12,121.88x = 114,028,314.64
  5. Step 5: Solve for x
    x = 114,028,314.64/12,121.88
  6. Step 6: Final answer
    x = 9,406.82

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