Home / 2,112.68-2,916.51-1,405.70

Finding the Fourth Proportional to 2,112.68, 2,916.51 and 1,405.70

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Solution

The fourth proportional to 2,112.68, 2,916.51 and 1,405.70 is: 1,940.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.68 : 2,916.51 = 1,405.70 : x
  2. Step 2: Convert to fraction form
    2,112.68/2,916.51 = 1,405.70/x
  3. Step 3: Cross multiply
    2,112.68x = 2,916.51 × 1,405.70
  4. Step 4: Simplify right side
    2,112.68x = 4,099,736.03
  5. Step 5: Solve for x
    x = 4,099,736.03/2,112.68
  6. Step 6: Final answer
    x = 1,940.54

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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.