Home / 2,862-3,947.40-1,979.28

Finding the Fourth Proportional to 2,862, 3,947.40 and 1,979.28

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Solution

The fourth proportional to 2,862, 3,947.40 and 1,979.28 is: 2,729.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,862 : 3,947.40 = 1,979.28 : x
  2. Step 2: Convert to fraction form
    2,862/3,947.40 = 1,979.28/x
  3. Step 3: Cross multiply
    2,862x = 3,947.40 × 1,979.28
  4. Step 4: Simplify right side
    2,862x = 7,813,009.87
  5. Step 5: Solve for x
    x = 7,813,009.87/2,862
  6. Step 6: Final answer
    x = 2,729.91

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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.