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Finding the Fourth Proportional to 939.39, 1,296.78 and 625.21

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Solution

The fourth proportional to 939.39, 1,296.78 and 625.21 is: 863.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.39 : 1,296.78 = 625.21 : x
  2. Step 2: Convert to fraction form
    939.39/1,296.78 = 625.21/x
  3. Step 3: Cross multiply
    939.39x = 1,296.78 × 625.21
  4. Step 4: Simplify right side
    939.39x = 810,750.21
  5. Step 5: Solve for x
    x = 810,750.21/939.39
  6. Step 6: Final answer
    x = 863.06

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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.