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Finding the Fourth Proportional to 682.36, 1,021.02 and 408.64

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Solution

The fourth proportional to 682.36, 1,021.02 and 408.64 is: 611.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.36 : 1,021.02 = 408.64 : x
  2. Step 2: Convert to fraction form
    682.36/1,021.02 = 408.64/x
  3. Step 3: Cross multiply
    682.36x = 1,021.02 × 408.64
  4. Step 4: Simplify right side
    682.36x = 417,229.61
  5. Step 5: Solve for x
    x = 417,229.61/682.36
  6. Step 6: Final answer
    x = 611.45

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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.