Home / 2,815.80-3,886.12-2,115.96

Finding the Fourth Proportional to 2,815.80, 3,886.12 and 2,115.96

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Solution

The fourth proportional to 2,815.80, 3,886.12 and 2,115.96 is: 2,920.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.80 : 3,886.12 = 2,115.96 : x
  2. Step 2: Convert to fraction form
    2,815.80/3,886.12 = 2,115.96/x
  3. Step 3: Cross multiply
    2,815.80x = 3,886.12 × 2,115.96
  4. Step 4: Simplify right side
    2,815.80x = 8,222,874.48
  5. Step 5: Solve for x
    x = 8,222,874.48/2,815.80
  6. Step 6: Final answer
    x = 2,920.26

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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.