Home / 2,821.40-3,893.46-1,643.12

Finding the Fourth Proportional to 2,821.40, 3,893.46 and 1,643.12

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Solution

The fourth proportional to 2,821.40, 3,893.46 and 1,643.12 is: 2,267.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,821.40 : 3,893.46 = 1,643.12 : x
  2. Step 2: Convert to fraction form
    2,821.40/3,893.46 = 1,643.12/x
  3. Step 3: Cross multiply
    2,821.40x = 3,893.46 × 1,643.12
  4. Step 4: Simplify right side
    2,821.40x = 6,397,422.00
  5. Step 5: Solve for x
    x = 6,397,422.00/2,821.40
  6. Step 6: Final answer
    x = 2,267.46

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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.