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Finding the Fourth Proportional to 6,912.36, 9,539.28 and 3,928.14

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Solution

The fourth proportional to 6,912.36, 9,539.28 and 3,928.14 is: 5,420.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,912.36 : 9,539.28 = 3,928.14 : x
  2. Step 2: Convert to fraction form
    6,912.36/9,539.28 = 3,928.14/x
  3. Step 3: Cross multiply
    6,912.36x = 9,539.28 × 3,928.14
  4. Step 4: Simplify right side
    6,912.36x = 37,471,627.34
  5. Step 5: Solve for x
    x = 37,471,627.34/6,912.36
  6. Step 6: Final answer
    x = 5,420.96

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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.