Home / 2,979.80-4,111.82-1,721.26

Finding the Fourth Proportional to 2,979.80, 4,111.82 and 1,721.26

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Solution

The fourth proportional to 2,979.80, 4,111.82 and 1,721.26 is: 2,375.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,979.80 : 4,111.82 = 1,721.26 : x
  2. Step 2: Convert to fraction form
    2,979.80/4,111.82 = 1,721.26/x
  3. Step 3: Cross multiply
    2,979.80x = 4,111.82 × 1,721.26
  4. Step 4: Simplify right side
    2,979.80x = 7,077,491.15
  5. Step 5: Solve for x
    x = 7,077,491.15/2,979.80
  6. Step 6: Final answer
    x = 2,375.16

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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.