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Finding the Fourth Proportional to 1,979.52, 2,729.88 and 1,279.68

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Solution

The fourth proportional to 1,979.52, 2,729.88 and 1,279.68 is: 1,764.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.52 : 2,729.88 = 1,279.68 : x
  2. Step 2: Convert to fraction form
    1,979.52/2,729.88 = 1,279.68/x
  3. Step 3: Cross multiply
    1,979.52x = 2,729.88 × 1,279.68
  4. Step 4: Simplify right side
    1,979.52x = 3,493,372.84
  5. Step 5: Solve for x
    x = 3,493,372.84/1,979.52
  6. Step 6: Final answer
    x = 1,764.76

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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.