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Finding the Fourth Proportional to 2,855.62, 3,939.75 and 1,910.97

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Solution

The fourth proportional to 2,855.62, 3,939.75 and 1,910.97 is: 2,636.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.62 : 3,939.75 = 1,910.97 : x
  2. Step 2: Convert to fraction form
    2,855.62/3,939.75 = 1,910.97/x
  3. Step 3: Cross multiply
    2,855.62x = 3,939.75 × 1,910.97
  4. Step 4: Simplify right side
    2,855.62x = 7,528,744.06
  5. Step 5: Solve for x
    x = 7,528,744.06/2,855.62
  6. Step 6: Final answer
    x = 2,636.47

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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.