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Finding the Fourth Proportional to 274.20, 378.30 and 191.28

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Solution

The fourth proportional to 274.20, 378.30 and 191.28 is: 263.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.20 : 378.30 = 191.28 : x
  2. Step 2: Convert to fraction form
    274.20/378.30 = 191.28/x
  3. Step 3: Cross multiply
    274.20x = 378.30 × 191.28
  4. Step 4: Simplify right side
    274.20x = 72,361.22
  5. Step 5: Solve for x
    x = 72,361.22/274.20
  6. Step 6: Final answer
    x = 263.90

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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.