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Finding the Fourth Proportional to 274.38, 378.57 and 186.90

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Solution

The fourth proportional to 274.38, 378.57 and 186.90 is: 257.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.38 : 378.57 = 186.90 : x
  2. Step 2: Convert to fraction form
    274.38/378.57 = 186.90/x
  3. Step 3: Cross multiply
    274.38x = 378.57 × 186.90
  4. Step 4: Simplify right side
    274.38x = 70,754.73
  5. Step 5: Solve for x
    x = 70,754.73/274.38
  6. Step 6: Final answer
    x = 257.87

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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.