Home / 3,899.78-5,381.68-2,131.38

Finding the Fourth Proportional to 3,899.78, 5,381.68 and 2,131.38

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Solution

The fourth proportional to 3,899.78, 5,381.68 and 2,131.38 is: 2,941.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.78 : 5,381.68 = 2,131.38 : x
  2. Step 2: Convert to fraction form
    3,899.78/5,381.68 = 2,131.38/x
  3. Step 3: Cross multiply
    3,899.78x = 5,381.68 × 2,131.38
  4. Step 4: Simplify right side
    3,899.78x = 11,470,394.46
  5. Step 5: Solve for x
    x = 11,470,394.46/3,899.78
  6. Step 6: Final answer
    x = 2,941.30

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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.