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Finding the Fourth Proportional to 18,729.84, 25,840.98 and 12,359.60

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Solution

The fourth proportional to 18,729.84, 25,840.98 and 12,359.60 is: 17,052.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,729.84 : 25,840.98 = 12,359.60 : x
  2. Step 2: Convert to fraction form
    18,729.84/25,840.98 = 12,359.60/x
  3. Step 3: Cross multiply
    18,729.84x = 25,840.98 × 12,359.60
  4. Step 4: Simplify right side
    18,729.84x = 319,384,176.41
  5. Step 5: Solve for x
    x = 319,384,176.41/18,729.84
  6. Step 6: Final answer
    x = 17,052.16

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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.