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Finding the Fourth Proportional to 3,876.70, 5,349.69 and 2,108.31

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Solution

The fourth proportional to 3,876.70, 5,349.69 and 2,108.31 is: 2,909.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,876.70 : 5,349.69 = 2,108.31 : x
  2. Step 2: Convert to fraction form
    3,876.70/5,349.69 = 2,108.31/x
  3. Step 3: Cross multiply
    3,876.70x = 5,349.69 × 2,108.31
  4. Step 4: Simplify right side
    3,876.70x = 11,278,778.18
  5. Step 5: Solve for x
    x = 11,278,778.18/3,876.70
  6. Step 6: Final answer
    x = 2,909.38

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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.