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Finding the Fourth Proportional to 490.68, 736.23 and 425.74

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Solution

The fourth proportional to 490.68, 736.23 and 425.74 is: 638.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.68 : 736.23 = 425.74 : x
  2. Step 2: Convert to fraction form
    490.68/736.23 = 425.74/x
  3. Step 3: Cross multiply
    490.68x = 736.23 × 425.74
  4. Step 4: Simplify right side
    490.68x = 313,442.56
  5. Step 5: Solve for x
    x = 313,442.56/490.68
  6. Step 6: Final answer
    x = 638.79

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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.