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Finding the Fourth Proportional to 493.56, 680.38 and 405.54

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Solution

The fourth proportional to 493.56, 680.38 and 405.54 is: 559.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.56 : 680.38 = 405.54 : x
  2. Step 2: Convert to fraction form
    493.56/680.38 = 405.54/x
  3. Step 3: Cross multiply
    493.56x = 680.38 × 405.54
  4. Step 4: Simplify right side
    493.56x = 275,921.31
  5. Step 5: Solve for x
    x = 275,921.31/493.56
  6. Step 6: Final answer
    x = 559.04

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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.