Home / 2,820.11-3,891.31-1,640.95

Finding the Fourth Proportional to 2,820.11, 3,891.31 and 1,640.95

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Solution

The fourth proportional to 2,820.11, 3,891.31 and 1,640.95 is: 2,264.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820.11 : 3,891.31 = 1,640.95 : x
  2. Step 2: Convert to fraction form
    2,820.11/3,891.31 = 1,640.95/x
  3. Step 3: Cross multiply
    2,820.11x = 3,891.31 × 1,640.95
  4. Step 4: Simplify right side
    2,820.11x = 6,385,431.31
  5. Step 5: Solve for x
    x = 6,385,431.31/2,820.11
  6. Step 6: Final answer
    x = 2,264.25

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1.5x scale

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.