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Finding the Fourth Proportional to 3,928.59, 5,393.01 and 3,891.66

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Solution

The fourth proportional to 3,928.59, 5,393.01 and 3,891.66 is: 5,342.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.59 : 5,393.01 = 3,891.66 : x
  2. Step 2: Convert to fraction form
    3,928.59/5,393.01 = 3,891.66/x
  3. Step 3: Cross multiply
    3,928.59x = 5,393.01 × 3,891.66
  4. Step 4: Simplify right side
    3,928.59x = 20,987,761.30
  5. Step 5: Solve for x
    x = 20,987,761.30/3,928.59
  6. Step 6: Final answer
    x = 5,342.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.