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Finding the Fourth Proportional to 682.08, 1,020.60 and 408.24

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Solution

The fourth proportional to 682.08, 1,020.60 and 408.24 is: 610.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.08 : 1,020.60 = 408.24 : x
  2. Step 2: Convert to fraction form
    682.08/1,020.60 = 408.24/x
  3. Step 3: Cross multiply
    682.08x = 1,020.60 × 408.24
  4. Step 4: Simplify right side
    682.08x = 416,649.74
  5. Step 5: Solve for x
    x = 416,649.74/682.08
  6. Step 6: Final answer
    x = 610.85

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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.