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Finding the Fourth Proportional to 103,896.44, 155,805.78 and 81,968.12

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Solution

The fourth proportional to 103,896.44, 155,805.78 and 81,968.12 is: 122,921.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,896.44 : 155,805.78 = 81,968.12 : x
  2. Step 2: Convert to fraction form
    103,896.44/155,805.78 = 81,968.12/x
  3. Step 3: Cross multiply
    103,896.44x = 155,805.78 × 81,968.12
  4. Step 4: Simplify right side
    103,896.44x = 12,771,106,871.73
  5. Step 5: Solve for x
    x = 12,771,106,871.73/103,896.44
  6. Step 6: Final answer
    x = 122,921.51

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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.