Home / 2,135.79-2,947.23-1,391.18

Finding the Fourth Proportional to 2,135.79, 2,947.23 and 1,391.18

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Solution

The fourth proportional to 2,135.79, 2,947.23 and 1,391.18 is: 1,919.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.79 : 2,947.23 = 1,391.18 : x
  2. Step 2: Convert to fraction form
    2,135.79/2,947.23 = 1,391.18/x
  3. Step 3: Cross multiply
    2,135.79x = 2,947.23 × 1,391.18
  4. Step 4: Simplify right side
    2,135.79x = 4,100,112.70
  5. Step 5: Solve for x
    x = 4,100,112.70/2,135.79
  6. Step 6: Final answer
    x = 1,919.72

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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.