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Finding the Fourth Proportional to 939.50, 1,296.78 and 629

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Solution

The fourth proportional to 939.50, 1,296.78 and 629 is: 868.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.50 : 1,296.78 = 629 : x
  2. Step 2: Convert to fraction form
    939.50/1,296.78 = 629/x
  3. Step 3: Cross multiply
    939.50x = 1,296.78 × 629
  4. Step 4: Simplify right side
    939.50x = 815,674.62
  5. Step 5: Solve for x
    x = 815,674.62/939.50
  6. Step 6: Final answer
    x = 868.20

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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.