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Finding the Fourth Proportional to 682.12, 1,022.46 and 438.82

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Solution

The fourth proportional to 682.12, 1,022.46 and 438.82 is: 657.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.12 : 1,022.46 = 438.82 : x
  2. Step 2: Convert to fraction form
    682.12/1,022.46 = 438.82/x
  3. Step 3: Cross multiply
    682.12x = 1,022.46 × 438.82
  4. Step 4: Simplify right side
    682.12x = 448,671.70
  5. Step 5: Solve for x
    x = 448,671.70/682.12
  6. Step 6: Final answer
    x = 657.76

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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.