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Finding the Fourth Proportional to 2,729.78, 4,094.70 and 781.97

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Solution

The fourth proportional to 2,729.78, 4,094.70 and 781.97 is: 1,172.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,729.78 : 4,094.70 = 781.97 : x
  2. Step 2: Convert to fraction form
    2,729.78/4,094.70 = 781.97/x
  3. Step 3: Cross multiply
    2,729.78x = 4,094.70 × 781.97
  4. Step 4: Simplify right side
    2,729.78x = 3,201,932.56
  5. Step 5: Solve for x
    x = 3,201,932.56/2,729.78
  6. Step 6: Final answer
    x = 1,172.96

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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.