Home / 2,072.20-2,859.78-1,286.50

Finding the Fourth Proportional to 2,072.20, 2,859.78 and 1,286.50

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Solution

The fourth proportional to 2,072.20, 2,859.78 and 1,286.50 is: 1,775.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.20 : 2,859.78 = 1,286.50 : x
  2. Step 2: Convert to fraction form
    2,072.20/2,859.78 = 1,286.50/x
  3. Step 3: Cross multiply
    2,072.20x = 2,859.78 × 1,286.50
  4. Step 4: Simplify right side
    2,072.20x = 3,679,106.97
  5. Step 5: Solve for x
    x = 3,679,106.97/2,072.20
  6. Step 6: Final answer
    x = 1,775.46

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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.