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Finding the Fourth Proportional to 78,940.36, 108,936.42 and 43,129.60

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Solution

The fourth proportional to 78,940.36, 108,936.42 and 43,129.60 is: 59,518.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,940.36 : 108,936.42 = 43,129.60 : x
  2. Step 2: Convert to fraction form
    78,940.36/108,936.42 = 43,129.60/x
  3. Step 3: Cross multiply
    78,940.36x = 108,936.42 × 43,129.60
  4. Step 4: Simplify right side
    78,940.36x = 4,698,384,548.79
  5. Step 5: Solve for x
    x = 4,698,384,548.79/78,940.36
  6. Step 6: Final answer
    x = 59,518.15

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Why These Related Problems?

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