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Finding the Fourth Proportional to 274.78, 411.79 and 213.63

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Solution

The fourth proportional to 274.78, 411.79 and 213.63 is: 320.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.78 : 411.79 = 213.63 : x
  2. Step 2: Convert to fraction form
    274.78/411.79 = 213.63/x
  3. Step 3: Cross multiply
    274.78x = 411.79 × 213.63
  4. Step 4: Simplify right side
    274.78x = 87,970.70
  5. Step 5: Solve for x
    x = 87,970.70/274.78
  6. Step 6: Final answer
    x = 320.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.