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Finding the Fourth Proportional to 351.17, 485.21 and 285.56

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Solution

The fourth proportional to 351.17, 485.21 and 285.56 is: 394.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.17 : 485.21 = 285.56 : x
  2. Step 2: Convert to fraction form
    351.17/485.21 = 285.56/x
  3. Step 3: Cross multiply
    351.17x = 485.21 × 285.56
  4. Step 4: Simplify right side
    351.17x = 138,556.57
  5. Step 5: Solve for x
    x = 138,556.57/351.17
  6. Step 6: Final answer
    x = 394.56

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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.