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Finding the Fourth Proportional to 682.64, 1,022.87 and 389.60

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Solution

The fourth proportional to 682.64, 1,022.87 and 389.60 is: 583.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.64 : 1,022.87 = 389.60 : x
  2. Step 2: Convert to fraction form
    682.64/1,022.87 = 389.60/x
  3. Step 3: Cross multiply
    682.64x = 1,022.87 × 389.60
  4. Step 4: Simplify right side
    682.64x = 398,506.01
  5. Step 5: Solve for x
    x = 398,506.01/682.64
  6. Step 6: Final answer
    x = 583.78

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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.