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Finding the Fourth Proportional to 490.82, 737.92 and 389.36

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Solution

The fourth proportional to 490.82, 737.92 and 389.36 is: 585.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.82 : 737.92 = 389.36 : x
  2. Step 2: Convert to fraction form
    490.82/737.92 = 389.36/x
  3. Step 3: Cross multiply
    490.82x = 737.92 × 389.36
  4. Step 4: Simplify right side
    490.82x = 287,316.53
  5. Step 5: Solve for x
    x = 287,316.53/490.82
  6. Step 6: Final answer
    x = 585.38

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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.