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Finding the Fourth Proportional to 351.72, 485.38 and 196.47

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Solution

The fourth proportional to 351.72, 485.38 and 196.47 is: 271.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.72 : 485.38 = 196.47 : x
  2. Step 2: Convert to fraction form
    351.72/485.38 = 196.47/x
  3. Step 3: Cross multiply
    351.72x = 485.38 × 196.47
  4. Step 4: Simplify right side
    351.72x = 95,361.63
  5. Step 5: Solve for x
    x = 95,361.63/351.72
  6. Step 6: Final answer
    x = 271.13

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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.