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Finding the Fourth Proportional to 353.31, 486.81 and 254.90

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Solution

The fourth proportional to 353.31, 486.81 and 254.90 is: 351.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.31 : 486.81 = 254.90 : x
  2. Step 2: Convert to fraction form
    353.31/486.81 = 254.90/x
  3. Step 3: Cross multiply
    353.31x = 486.81 × 254.90
  4. Step 4: Simplify right side
    353.31x = 124,085.43
  5. Step 5: Solve for x
    x = 124,085.43/353.31
  6. Step 6: Final answer
    x = 351.21

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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.