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Finding the Fourth Proportional to 771.28, 1,063.38 and 629.80

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Solution

The fourth proportional to 771.28, 1,063.38 and 629.80 is: 868.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.28 : 1,063.38 = 629.80 : x
  2. Step 2: Convert to fraction form
    771.28/1,063.38 = 629.80/x
  3. Step 3: Cross multiply
    771.28x = 1,063.38 × 629.80
  4. Step 4: Simplify right side
    771.28x = 669,716.72
  5. Step 5: Solve for x
    x = 669,716.72/771.28
  6. Step 6: Final answer
    x = 868.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.