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Finding the Fourth Proportional to 275,108, 379,654.80 and 155,876

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Solution

The fourth proportional to 275,108, 379,654.80 and 155,876 is: 215,112.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,108 : 379,654.80 = 155,876 : x
  2. Step 2: Convert to fraction form
    275,108/379,654.80 = 155,876/x
  3. Step 3: Cross multiply
    275,108x = 379,654.80 × 155,876
  4. Step 4: Simplify right side
    275,108x = 59,179,071,604.80
  5. Step 5: Solve for x
    x = 59,179,071,604.80/275,108
  6. Step 6: Final answer
    x = 215,112.14

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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.