Home / 2,979.68-4,112.12-1,918.08

Finding the Fourth Proportional to 2,979.68, 4,112.12 and 1,918.08

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Solution

The fourth proportional to 2,979.68, 4,112.12 and 1,918.08 is: 2,647.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,979.68 : 4,112.12 = 1,918.08 : x
  2. Step 2: Convert to fraction form
    2,979.68/4,112.12 = 1,918.08/x
  3. Step 3: Cross multiply
    2,979.68x = 4,112.12 × 1,918.08
  4. Step 4: Simplify right side
    2,979.68x = 7,887,375.13
  5. Step 5: Solve for x
    x = 7,887,375.13/2,979.68
  6. Step 6: Final answer
    x = 2,647.05

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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.