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Finding the Fourth Proportional to 274.20, 378.66 and 212.64

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Solution

The fourth proportional to 274.20, 378.66 and 212.64 is: 293.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.20 : 378.66 = 212.64 : x
  2. Step 2: Convert to fraction form
    274.20/378.66 = 212.64/x
  3. Step 3: Cross multiply
    274.20x = 378.66 × 212.64
  4. Step 4: Simplify right side
    274.20x = 80,518.26
  5. Step 5: Solve for x
    x = 80,518.26/274.20
  6. Step 6: Final answer
    x = 293.65

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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.