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Finding the Fourth Proportional to 352.78, 486.68 and 274.12

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Solution

The fourth proportional to 352.78, 486.68 and 274.12 is: 378.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.78 : 486.68 = 274.12 : x
  2. Step 2: Convert to fraction form
    352.78/486.68 = 274.12/x
  3. Step 3: Cross multiply
    352.78x = 486.68 × 274.12
  4. Step 4: Simplify right side
    352.78x = 133,408.72
  5. Step 5: Solve for x
    x = 133,408.72/352.78
  6. Step 6: Final answer
    x = 378.16

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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.