Home / 1,979.78-2,733.36-1,391.72

Finding the Fourth Proportional to 1,979.78, 2,733.36 and 1,391.72

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Solution

The fourth proportional to 1,979.78, 2,733.36 and 1,391.72 is: 1,921.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.78 : 2,733.36 = 1,391.72 : x
  2. Step 2: Convert to fraction form
    1,979.78/2,733.36 = 1,391.72/x
  3. Step 3: Cross multiply
    1,979.78x = 2,733.36 × 1,391.72
  4. Step 4: Simplify right side
    1,979.78x = 3,804,071.78
  5. Step 5: Solve for x
    x = 3,804,071.78/1,979.78
  6. Step 6: Final answer
    x = 1,921.46

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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.