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Finding the Fourth Proportional to 6,912.82, 9,540.15 and 3,928.66

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Solution

The fourth proportional to 6,912.82, 9,540.15 and 3,928.66 is: 5,421.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,912.82 : 9,540.15 = 3,928.66 : x
  2. Step 2: Convert to fraction form
    6,912.82/9,540.15 = 3,928.66/x
  3. Step 3: Cross multiply
    6,912.82x = 9,540.15 × 3,928.66
  4. Step 4: Simplify right side
    6,912.82x = 37,480,005.70
  5. Step 5: Solve for x
    x = 37,480,005.70/6,912.82
  6. Step 6: Final answer
    x = 5,421.81

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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.