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Finding the Fourth Proportional to 274.78, 378.70 and 212.50

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Solution

The fourth proportional to 274.78, 378.70 and 212.50 is: 292.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.78 : 378.70 = 212.50 : x
  2. Step 2: Convert to fraction form
    274.78/378.70 = 212.50/x
  3. Step 3: Cross multiply
    274.78x = 378.70 × 212.50
  4. Step 4: Simplify right side
    274.78x = 80,473.75
  5. Step 5: Solve for x
    x = 80,473.75/274.78
  6. Step 6: Final answer
    x = 292.87

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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.