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Finding the Fourth Proportional to 494.20, 681.98 and 319.64

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Solution

The fourth proportional to 494.20, 681.98 and 319.64 is: 441.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.20 : 681.98 = 319.64 : x
  2. Step 2: Convert to fraction form
    494.20/681.98 = 319.64/x
  3. Step 3: Cross multiply
    494.20x = 681.98 × 319.64
  4. Step 4: Simplify right side
    494.20x = 217,986.49
  5. Step 5: Solve for x
    x = 217,986.49/494.20
  6. Step 6: Final answer
    x = 441.09

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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.