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Finding the Fourth Proportional to 274.78, 379.26 and 158.40

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Solution

The fourth proportional to 274.78, 379.26 and 158.40 is: 218.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.78 : 379.26 = 158.40 : x
  2. Step 2: Convert to fraction form
    274.78/379.26 = 158.40/x
  3. Step 3: Cross multiply
    274.78x = 379.26 × 158.40
  4. Step 4: Simplify right side
    274.78x = 60,074.78
  5. Step 5: Solve for x
    x = 60,074.78/274.78
  6. Step 6: Final answer
    x = 218.63

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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.