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Finding the Fourth Proportional to 7,859.80, 11,790.78 and 3,964.60

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Solution

The fourth proportional to 7,859.80, 11,790.78 and 3,964.60 is: 5,947.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,859.80 : 11,790.78 = 3,964.60 : x
  2. Step 2: Convert to fraction form
    7,859.80/11,790.78 = 3,964.60/x
  3. Step 3: Cross multiply
    7,859.80x = 11,790.78 × 3,964.60
  4. Step 4: Simplify right side
    7,859.80x = 46,745,726.39
  5. Step 5: Solve for x
    x = 46,745,726.39/7,859.80
  6. Step 6: Final answer
    x = 5,947.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.