Home / 2,128.21-2,921.18-1,886.87

Finding the Fourth Proportional to 2,128.21, 2,921.18 and 1,886.87

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Solution

The fourth proportional to 2,128.21, 2,921.18 and 1,886.87 is: 2,589.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.21 : 2,921.18 = 1,886.87 : x
  2. Step 2: Convert to fraction form
    2,128.21/2,921.18 = 1,886.87/x
  3. Step 3: Cross multiply
    2,128.21x = 2,921.18 × 1,886.87
  4. Step 4: Simplify right side
    2,128.21x = 5,511,884.78
  5. Step 5: Solve for x
    x = 5,511,884.78/2,128.21
  6. Step 6: Final answer
    x = 2,589.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.