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Finding the Fourth Proportional to 494.87, 682.90 and 285.11

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Solution

The fourth proportional to 494.87, 682.90 and 285.11 is: 393.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.87 : 682.90 = 285.11 : x
  2. Step 2: Convert to fraction form
    494.87/682.90 = 285.11/x
  3. Step 3: Cross multiply
    494.87x = 682.90 × 285.11
  4. Step 4: Simplify right side
    494.87x = 194,701.62
  5. Step 5: Solve for x
    x = 194,701.62/494.87
  6. Step 6: Final answer
    x = 393.44

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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.