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Finding the Fourth Proportional to 273.89, 378.70 and 239.31

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Solution

The fourth proportional to 273.89, 378.70 and 239.31 is: 330.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.89 : 378.70 = 239.31 : x
  2. Step 2: Convert to fraction form
    273.89/378.70 = 239.31/x
  3. Step 3: Cross multiply
    273.89x = 378.70 × 239.31
  4. Step 4: Simplify right side
    273.89x = 90,623.61
  5. Step 5: Solve for x
    x = 90,623.61/273.89
  6. Step 6: Final answer
    x = 330.88

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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.