Home / 2,979.78-4,112.36-1,721.28

Finding the Fourth Proportional to 2,979.78, 4,112.36 and 1,721.28

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Solution

The fourth proportional to 2,979.78, 4,112.36 and 1,721.28 is: 2,375.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,979.78 : 4,112.36 = 1,721.28 : x
  2. Step 2: Convert to fraction form
    2,979.78/4,112.36 = 1,721.28/x
  3. Step 3: Cross multiply
    2,979.78x = 4,112.36 × 1,721.28
  4. Step 4: Simplify right side
    2,979.78x = 7,078,523.02
  5. Step 5: Solve for x
    x = 7,078,523.02/2,979.78
  6. Step 6: Final answer
    x = 2,375.52

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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.