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Finding the Fourth Proportional to 496.92, 685.85 and 287.22

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Solution

The fourth proportional to 496.92, 685.85 and 287.22 is: 396.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.92 : 685.85 = 287.22 : x
  2. Step 2: Convert to fraction form
    496.92/685.85 = 287.22/x
  3. Step 3: Cross multiply
    496.92x = 685.85 × 287.22
  4. Step 4: Simplify right side
    496.92x = 196,988.40
  5. Step 5: Solve for x
    x = 196,988.40/496.92
  6. Step 6: Final answer
    x = 396.42

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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.