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Finding the Fourth Proportional to 78,939.62, 108,930.98 and 43,122.03

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Solution

The fourth proportional to 78,939.62, 108,930.98 and 43,122.03 is: 59,505.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,939.62 : 108,930.98 = 43,122.03 : x
  2. Step 2: Convert to fraction form
    78,939.62/108,930.98 = 43,122.03/x
  3. Step 3: Cross multiply
    78,939.62x = 108,930.98 × 43,122.03
  4. Step 4: Simplify right side
    78,939.62x = 4,697,324,987.49
  5. Step 5: Solve for x
    x = 4,697,324,987.49/78,939.62
  6. Step 6: Final answer
    x = 59,505.29

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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.