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Finding the Fourth Proportional to 1,978.80, 2,729.28 and 1,279.44

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Solution

The fourth proportional to 1,978.80, 2,729.28 and 1,279.44 is: 1,764.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.80 : 2,729.28 = 1,279.44 : x
  2. Step 2: Convert to fraction form
    1,978.80/2,729.28 = 1,279.44/x
  3. Step 3: Cross multiply
    1,978.80x = 2,729.28 × 1,279.44
  4. Step 4: Simplify right side
    1,978.80x = 3,491,950.00
  5. Step 5: Solve for x
    x = 3,491,950.00/1,978.80
  6. Step 6: Final answer
    x = 1,764.68

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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.