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Finding the Fourth Proportional to 274.29, 411.40 and 191.78

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Solution

The fourth proportional to 274.29, 411.40 and 191.78 is: 287.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.29 : 411.40 = 191.78 : x
  2. Step 2: Convert to fraction form
    274.29/411.40 = 191.78/x
  3. Step 3: Cross multiply
    274.29x = 411.40 × 191.78
  4. Step 4: Simplify right side
    274.29x = 78,895.28
  5. Step 5: Solve for x
    x = 78,895.28/274.29
  6. Step 6: Final answer
    x = 287.63

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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.