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Finding the Fourth Proportional to 496.32, 685.44 and 393.60

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Solution

The fourth proportional to 496.32, 685.44 and 393.60 is: 543.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.32 : 685.44 = 393.60 : x
  2. Step 2: Convert to fraction form
    496.32/685.44 = 393.60/x
  3. Step 3: Cross multiply
    496.32x = 685.44 × 393.60
  4. Step 4: Simplify right side
    496.32x = 269,789.18
  5. Step 5: Solve for x
    x = 269,789.18/496.32
  6. Step 6: Final answer
    x = 543.58

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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.