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Finding the Fourth Proportional to 496.64, 685.07 and 319.55

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Solution

The fourth proportional to 496.64, 685.07 and 319.55 is: 440.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.64 : 685.07 = 319.55 : x
  2. Step 2: Convert to fraction form
    496.64/685.07 = 319.55/x
  3. Step 3: Cross multiply
    496.64x = 685.07 × 319.55
  4. Step 4: Simplify right side
    496.64x = 218,914.12
  5. Step 5: Solve for x
    x = 218,914.12/496.64
  6. Step 6: Final answer
    x = 440.79

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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.