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Finding the Fourth Proportional to 274.40, 411.64 and 171.54

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Solution

The fourth proportional to 274.40, 411.64 and 171.54 is: 257.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.40 : 411.64 = 171.54 : x
  2. Step 2: Convert to fraction form
    274.40/411.64 = 171.54/x
  3. Step 3: Cross multiply
    274.40x = 411.64 × 171.54
  4. Step 4: Simplify right side
    274.40x = 70,612.73
  5. Step 5: Solve for x
    x = 70,612.73/274.40
  6. Step 6: Final answer
    x = 257.34

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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.