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Finding the Fourth Proportional to 490.90, 677.10 and 316.30

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Solution

The fourth proportional to 490.90, 677.10 and 316.30 is: 436.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.90 : 677.10 = 316.30 : x
  2. Step 2: Convert to fraction form
    490.90/677.10 = 316.30/x
  3. Step 3: Cross multiply
    490.90x = 677.10 × 316.30
  4. Step 4: Simplify right side
    490.90x = 214,166.73
  5. Step 5: Solve for x
    x = 214,166.73/490.90
  6. Step 6: Final answer
    x = 436.27

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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.