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Finding the Fourth Proportional to 494.34, 682.05 and 319.74

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Solution

The fourth proportional to 494.34, 682.05 and 319.74 is: 441.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.34 : 682.05 = 319.74 : x
  2. Step 2: Convert to fraction form
    494.34/682.05 = 319.74/x
  3. Step 3: Cross multiply
    494.34x = 682.05 × 319.74
  4. Step 4: Simplify right side
    494.34x = 218,078.67
  5. Step 5: Solve for x
    x = 218,078.67/494.34
  6. Step 6: Final answer
    x = 441.15

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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.