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Finding the Fourth Proportional to 494.48, 682.61 and 355.30

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Solution

The fourth proportional to 494.48, 682.61 and 355.30 is: 490.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.48 : 682.61 = 355.30 : x
  2. Step 2: Convert to fraction form
    494.48/682.61 = 355.30/x
  3. Step 3: Cross multiply
    494.48x = 682.61 × 355.30
  4. Step 4: Simplify right side
    494.48x = 242,527.85
  5. Step 5: Solve for x
    x = 242,527.85/494.48
  6. Step 6: Final answer
    x = 490.47

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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.