Home / 2,121.80-3,185.10-1,256.60

Finding the Fourth Proportional to 2,121.80, 3,185.10 and 1,256.60

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Solution

The fourth proportional to 2,121.80, 3,185.10 and 1,256.60 is: 1,886.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.80 : 3,185.10 = 1,256.60 : x
  2. Step 2: Convert to fraction form
    2,121.80/3,185.10 = 1,256.60/x
  3. Step 3: Cross multiply
    2,121.80x = 3,185.10 × 1,256.60
  4. Step 4: Simplify right side
    2,121.80x = 4,002,396.66
  5. Step 5: Solve for x
    x = 4,002,396.66/2,121.80
  6. Step 6: Final answer
    x = 1,886.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.