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Finding the Fourth Proportional to 274, 378.17 and 157.54

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Solution

The fourth proportional to 274, 378.17 and 157.54 is: 217.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    274 : 378.17 = 157.54 : x
  2. Step 2: Convert to fraction form
    274/378.17 = 157.54/x
  3. Step 3: Cross multiply
    274x = 378.17 × 157.54
  4. Step 4: Simplify right side
    274x = 59,576.11
  5. Step 5: Solve for x
    x = 59,576.11/274
  6. Step 6: Final answer
    x = 217.43

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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.