Home / 2,891.20-3,989.88-1,696.90

Finding the Fourth Proportional to 2,891.20, 3,989.88 and 1,696.90

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Solution

The fourth proportional to 2,891.20, 3,989.88 and 1,696.90 is: 2,341.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.20 : 3,989.88 = 1,696.90 : x
  2. Step 2: Convert to fraction form
    2,891.20/3,989.88 = 1,696.90/x
  3. Step 3: Cross multiply
    2,891.20x = 3,989.88 × 1,696.90
  4. Step 4: Simplify right side
    2,891.20x = 6,770,427.37
  5. Step 5: Solve for x
    x = 6,770,427.37/2,891.20
  6. Step 6: Final answer
    x = 2,341.74

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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.