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Finding the Fourth Proportional to 684.81, 1,028.46 and 629.87

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Solution

The fourth proportional to 684.81, 1,028.46 and 629.87 is: 945.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.81 : 1,028.46 = 629.87 : x
  2. Step 2: Convert to fraction form
    684.81/1,028.46 = 629.87/x
  3. Step 3: Cross multiply
    684.81x = 1,028.46 × 629.87
  4. Step 4: Simplify right side
    684.81x = 647,790.90
  5. Step 5: Solve for x
    x = 647,790.90/684.81
  6. Step 6: Final answer
    x = 945.94

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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.