Home / 1,979.36-2,733.20-1,391.20

Finding the Fourth Proportional to 1,979.36, 2,733.20 and 1,391.20

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Solution

The fourth proportional to 1,979.36, 2,733.20 and 1,391.20 is: 1,921.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.36 : 2,733.20 = 1,391.20 : x
  2. Step 2: Convert to fraction form
    1,979.36/2,733.20 = 1,391.20/x
  3. Step 3: Cross multiply
    1,979.36x = 2,733.20 × 1,391.20
  4. Step 4: Simplify right side
    1,979.36x = 3,802,427.84
  5. Step 5: Solve for x
    x = 3,802,427.84/1,979.36
  6. Step 6: Final answer
    x = 1,921.04

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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.