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Finding the Fourth Proportional to 13,129, 19,696.74 and 3,895

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Solution

The fourth proportional to 13,129, 19,696.74 and 3,895 is: 5,843.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,129 : 19,696.74 = 3,895 : x
  2. Step 2: Convert to fraction form
    13,129/19,696.74 = 3,895/x
  3. Step 3: Cross multiply
    13,129x = 19,696.74 × 3,895
  4. Step 4: Simplify right side
    13,129x = 76,718,802.30
  5. Step 5: Solve for x
    x = 76,718,802.30/13,129
  6. Step 6: Final answer
    x = 5,843.46

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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.