Home / 2,121.12-2,921.92-1,805.38

Finding the Fourth Proportional to 2,121.12, 2,921.92 and 1,805.38

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Solution

The fourth proportional to 2,121.12, 2,921.92 and 1,805.38 is: 2,486.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.12 : 2,921.92 = 1,805.38 : x
  2. Step 2: Convert to fraction form
    2,121.12/2,921.92 = 1,805.38/x
  3. Step 3: Cross multiply
    2,121.12x = 2,921.92 × 1,805.38
  4. Step 4: Simplify right side
    2,121.12x = 5,275,175.93
  5. Step 5: Solve for x
    x = 5,275,175.93/2,121.12
  6. Step 6: Final answer
    x = 2,486.98

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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.