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Finding the Fourth Proportional to 6,912.64, 9,539.70 and 3,928.98

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Solution

The fourth proportional to 6,912.64, 9,539.70 and 3,928.98 is: 5,422.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,912.64 : 9,539.70 = 3,928.98 : x
  2. Step 2: Convert to fraction form
    6,912.64/9,539.70 = 3,928.98/x
  3. Step 3: Cross multiply
    6,912.64x = 9,539.70 × 3,928.98
  4. Step 4: Simplify right side
    6,912.64x = 37,481,290.51
  5. Step 5: Solve for x
    x = 37,481,290.51/6,912.64
  6. Step 6: Final answer
    x = 5,422.14

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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.