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Finding the Fourth Proportional to 490.82, 677.20 and 316.26

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Solution

The fourth proportional to 490.82, 677.20 and 316.26 is: 436.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.82 : 677.20 = 316.26 : x
  2. Step 2: Convert to fraction form
    490.82/677.20 = 316.26/x
  3. Step 3: Cross multiply
    490.82x = 677.20 × 316.26
  4. Step 4: Simplify right side
    490.82x = 214,171.27
  5. Step 5: Solve for x
    x = 214,171.27/490.82
  6. Step 6: Final answer
    x = 436.35

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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.