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Finding the Fourth Proportional to 494.89, 682.96 and 285.13

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Solution

The fourth proportional to 494.89, 682.96 and 285.13 is: 393.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.89 : 682.96 = 285.13 : x
  2. Step 2: Convert to fraction form
    494.89/682.96 = 285.13/x
  3. Step 3: Cross multiply
    494.89x = 682.96 × 285.13
  4. Step 4: Simplify right side
    494.89x = 194,729.96
  5. Step 5: Solve for x
    x = 194,729.96/494.89
  6. Step 6: Final answer
    x = 393.48

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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.