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Finding the Fourth Proportional to 7,964.80, 11,947.20 and 3,806.80

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Solution

The fourth proportional to 7,964.80, 11,947.20 and 3,806.80 is: 5,710.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,964.80 : 11,947.20 = 3,806.80 : x
  2. Step 2: Convert to fraction form
    7,964.80/11,947.20 = 3,806.80/x
  3. Step 3: Cross multiply
    7,964.80x = 11,947.20 × 3,806.80
  4. Step 4: Simplify right side
    7,964.80x = 45,480,600.96
  5. Step 5: Solve for x
    x = 45,480,600.96/7,964.80
  6. Step 6: Final answer
    x = 5,710.20

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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.