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Finding the Fourth Proportional to 274.67, 378.80 and 212.30

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Solution

The fourth proportional to 274.67, 378.80 and 212.30 is: 292.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.67 : 378.80 = 212.30 : x
  2. Step 2: Convert to fraction form
    274.67/378.80 = 212.30/x
  3. Step 3: Cross multiply
    274.67x = 378.80 × 212.30
  4. Step 4: Simplify right side
    274.67x = 80,419.24
  5. Step 5: Solve for x
    x = 80,419.24/274.67
  6. Step 6: Final answer
    x = 292.78

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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.