Home / 1,979.80-2,733.78-1,720.60

Finding the Fourth Proportional to 1,979.80, 2,733.78 and 1,720.60

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Solution

The fourth proportional to 1,979.80, 2,733.78 and 1,720.60 is: 2,375.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.80 : 2,733.78 = 1,720.60 : x
  2. Step 2: Convert to fraction form
    1,979.80/2,733.78 = 1,720.60/x
  3. Step 3: Cross multiply
    1,979.80x = 2,733.78 × 1,720.60
  4. Step 4: Simplify right side
    1,979.80x = 4,703,741.87
  5. Step 5: Solve for x
    x = 4,703,741.87/1,979.80
  6. Step 6: Final answer
    x = 2,375.87

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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.