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Finding the Fourth Proportional to 3,899.39, 5,381.16 and 2,131.00

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Solution

The fourth proportional to 3,899.39, 5,381.16 and 2,131.00 is: 2,940.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.39 : 5,381.16 = 2,131.00 : x
  2. Step 2: Convert to fraction form
    3,899.39/5,381.16 = 2,131.00/x
  3. Step 3: Cross multiply
    3,899.39x = 5,381.16 × 2,131.00
  4. Step 4: Simplify right side
    3,899.39x = 11,467,228.94
  5. Step 5: Solve for x
    x = 11,467,228.94/3,899.39
  6. Step 6: Final answer
    x = 2,940.77

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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.