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Finding the Fourth Proportional to 682.35, 1,028.31 and 649.41

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Solution

The fourth proportional to 682.35, 1,028.31 and 649.41 is: 978.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.35 : 1,028.31 = 649.41 : x
  2. Step 2: Convert to fraction form
    682.35/1,028.31 = 649.41/x
  3. Step 3: Cross multiply
    682.35x = 1,028.31 × 649.41
  4. Step 4: Simplify right side
    682.35x = 667,794.80
  5. Step 5: Solve for x
    x = 667,794.80/682.35
  6. Step 6: Final answer
    x = 978.67

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.