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Finding the Fourth Proportional to 274.23, 378.39 and 157.83

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Solution

The fourth proportional to 274.23, 378.39 and 157.83 is: 217.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.23 : 378.39 = 157.83 : x
  2. Step 2: Convert to fraction form
    274.23/378.39 = 157.83/x
  3. Step 3: Cross multiply
    274.23x = 378.39 × 157.83
  4. Step 4: Simplify right side
    274.23x = 59,721.29
  5. Step 5: Solve for x
    x = 59,721.29/274.23
  6. Step 6: Final answer
    x = 217.78

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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.