Home / 2,128.60-3,195.30-1,643.80

Finding the Fourth Proportional to 2,128.60, 3,195.30 and 1,643.80

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Solution

The fourth proportional to 2,128.60, 3,195.30 and 1,643.80 is: 2,467.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.60 : 3,195.30 = 1,643.80 : x
  2. Step 2: Convert to fraction form
    2,128.60/3,195.30 = 1,643.80/x
  3. Step 3: Cross multiply
    2,128.60x = 3,195.30 × 1,643.80
  4. Step 4: Simplify right side
    2,128.60x = 5,252,434.14
  5. Step 5: Solve for x
    x = 5,252,434.14/2,128.60
  6. Step 6: Final answer
    x = 2,467.55

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1.5x scale

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.