Home / 2,908.38-3,987.40-2,855.73

Finding the Fourth Proportional to 2,908.38, 3,987.40 and 2,855.73

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Solution

The fourth proportional to 2,908.38, 3,987.40 and 2,855.73 is: 3,915.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,908.38 : 3,987.40 = 2,855.73 : x
  2. Step 2: Convert to fraction form
    2,908.38/3,987.40 = 2,855.73/x
  3. Step 3: Cross multiply
    2,908.38x = 3,987.40 × 2,855.73
  4. Step 4: Simplify right side
    2,908.38x = 11,386,930.66
  5. Step 5: Solve for x
    x = 11,386,930.66/2,908.38
  6. Step 6: Final answer
    x = 3,915.21

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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.