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Finding the Fourth Proportional to 496.40, 685.22 and 321.75

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Solution

The fourth proportional to 496.40, 685.22 and 321.75 is: 444.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.40 : 685.22 = 321.75 : x
  2. Step 2: Convert to fraction form
    496.40/685.22 = 321.75/x
  3. Step 3: Cross multiply
    496.40x = 685.22 × 321.75
  4. Step 4: Simplify right side
    496.40x = 220,467.93
  5. Step 5: Solve for x
    x = 220,467.93/496.40
  6. Step 6: Final answer
    x = 444.14

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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.