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Finding the Fourth Proportional to 490.99, 677.61 and 304.64

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Solution

The fourth proportional to 490.99, 677.61 and 304.64 is: 420.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.99 : 677.61 = 304.64 : x
  2. Step 2: Convert to fraction form
    490.99/677.61 = 304.64/x
  3. Step 3: Cross multiply
    490.99x = 677.61 × 304.64
  4. Step 4: Simplify right side
    490.99x = 206,427.11
  5. Step 5: Solve for x
    x = 206,427.11/490.99
  6. Step 6: Final answer
    x = 420.43

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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.