Home / 2,128.20-3,189.24-1,983.66

Finding the Fourth Proportional to 2,128.20, 3,189.24 and 1,983.66

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Solution

The fourth proportional to 2,128.20, 3,189.24 and 1,983.66 is: 2,972.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.20 : 3,189.24 = 1,983.66 : x
  2. Step 2: Convert to fraction form
    2,128.20/3,189.24 = 1,983.66/x
  3. Step 3: Cross multiply
    2,128.20x = 3,189.24 × 1,983.66
  4. Step 4: Simplify right side
    2,128.20x = 6,326,367.82
  5. Step 5: Solve for x
    x = 6,326,367.82/2,128.20
  6. Step 6: Final answer
    x = 2,972.64

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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.