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Finding the Fourth Proportional to 12,940.08, 17,858.04 and 9,790.80

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Solution

The fourth proportional to 12,940.08, 17,858.04 and 9,790.80 is: 13,511.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.08 : 17,858.04 = 9,790.80 : x
  2. Step 2: Convert to fraction form
    12,940.08/17,858.04 = 9,790.80/x
  3. Step 3: Cross multiply
    12,940.08x = 17,858.04 × 9,790.80
  4. Step 4: Simplify right side
    12,940.08x = 174,844,498.03
  5. Step 5: Solve for x
    x = 174,844,498.03/12,940.08
  6. Step 6: Final answer
    x = 13,511.86

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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.