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Finding the Fourth Proportional to 3,876.60, 5,349.60 and 2,108.28

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Solution

The fourth proportional to 3,876.60, 5,349.60 and 2,108.28 is: 2,909.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,876.60 : 5,349.60 = 2,108.28 : x
  2. Step 2: Convert to fraction form
    3,876.60/5,349.60 = 2,108.28/x
  3. Step 3: Cross multiply
    3,876.60x = 5,349.60 × 2,108.28
  4. Step 4: Simplify right side
    3,876.60x = 11,278,454.69
  5. Step 5: Solve for x
    x = 11,278,454.69/3,876.60
  6. Step 6: Final answer
    x = 2,909.37

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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.