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Finding the Fourth Proportional to 274.78, 379.11 and 171.34

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Solution

The fourth proportional to 274.78, 379.11 and 171.34 is: 236.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.78 : 379.11 = 171.34 : x
  2. Step 2: Convert to fraction form
    274.78/379.11 = 171.34/x
  3. Step 3: Cross multiply
    274.78x = 379.11 × 171.34
  4. Step 4: Simplify right side
    274.78x = 64,956.71
  5. Step 5: Solve for x
    x = 64,956.71/274.78
  6. Step 6: Final answer
    x = 236.40

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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.