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Finding the Fourth Proportional to 274.45, 378.02 and 211.31

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Solution

The fourth proportional to 274.45, 378.02 and 211.31 is: 291.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.45 : 378.02 = 211.31 : x
  2. Step 2: Convert to fraction form
    274.45/378.02 = 211.31/x
  3. Step 3: Cross multiply
    274.45x = 378.02 × 211.31
  4. Step 4: Simplify right side
    274.45x = 79,879.41
  5. Step 5: Solve for x
    x = 79,879.41/274.45
  6. Step 6: Final answer
    x = 291.06

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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.