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Finding the Fourth Proportional to 490.80, 736.59 and 285.66

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Solution

The fourth proportional to 490.80, 736.59 and 285.66 is: 428.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.80 : 736.59 = 285.66 : x
  2. Step 2: Convert to fraction form
    490.80/736.59 = 285.66/x
  3. Step 3: Cross multiply
    490.80x = 736.59 × 285.66
  4. Step 4: Simplify right side
    490.80x = 210,414.30
  5. Step 5: Solve for x
    x = 210,414.30/490.80
  6. Step 6: Final answer
    x = 428.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.