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Finding the Fourth Proportional to 78,920.22, 108,905.94 and 43,103.64

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Solution

The fourth proportional to 78,920.22, 108,905.94 and 43,103.64 is: 59,480.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.22 : 108,905.94 = 43,103.64 : x
  2. Step 2: Convert to fraction form
    78,920.22/108,905.94 = 43,103.64/x
  3. Step 3: Cross multiply
    78,920.22x = 108,905.94 × 43,103.64
  4. Step 4: Simplify right side
    78,920.22x = 4,694,242,431.62
  5. Step 5: Solve for x
    x = 4,694,242,431.62/78,920.22
  6. Step 6: Final answer
    x = 59,480.86

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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.