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Finding the Fourth Proportional to 79,138.44, 109,206.90 and 43,321.59

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Solution

The fourth proportional to 79,138.44, 109,206.90 and 43,321.59 is: 59,781.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,138.44 : 109,206.90 = 43,321.59 : x
  2. Step 2: Convert to fraction form
    79,138.44/109,206.90 = 43,321.59/x
  3. Step 3: Cross multiply
    79,138.44x = 109,206.90 × 43,321.59
  4. Step 4: Simplify right side
    79,138.44x = 4,731,016,546.97
  5. Step 5: Solve for x
    x = 4,731,016,546.97/79,138.44
  6. Step 6: Final answer
    x = 59,781.52

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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.