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Finding the Fourth Proportional to 939.78, 1,294.38 and 865.98

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Solution

The fourth proportional to 939.78, 1,294.38 and 865.98 is: 1,192.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.78 : 1,294.38 = 865.98 : x
  2. Step 2: Convert to fraction form
    939.78/1,294.38 = 865.98/x
  3. Step 3: Cross multiply
    939.78x = 1,294.38 × 865.98
  4. Step 4: Simplify right side
    939.78x = 1,120,907.19
  5. Step 5: Solve for x
    x = 1,120,907.19/939.78
  6. Step 6: Final answer
    x = 1,192.73

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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.