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Finding the Fourth Proportional to 3,930.76, 5,396.02 and 3,893.84

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Solution

The fourth proportional to 3,930.76, 5,396.02 and 3,893.84 is: 5,345.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,930.76 : 5,396.02 = 3,893.84 : x
  2. Step 2: Convert to fraction form
    3,930.76/5,396.02 = 3,893.84/x
  3. Step 3: Cross multiply
    3,930.76x = 5,396.02 × 3,893.84
  4. Step 4: Simplify right side
    3,930.76x = 21,011,238.52
  5. Step 5: Solve for x
    x = 21,011,238.52/3,930.76
  6. Step 6: Final answer
    x = 5,345.34

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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.