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Finding the Fourth Proportional to 7,912.80, 11,871.60 and 2,983.92

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Solution

The fourth proportional to 7,912.80, 11,871.60 and 2,983.92 is: 4,476.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,912.80 : 11,871.60 = 2,983.92 : x
  2. Step 2: Convert to fraction form
    7,912.80/11,871.60 = 2,983.92/x
  3. Step 3: Cross multiply
    7,912.80x = 11,871.60 × 2,983.92
  4. Step 4: Simplify right side
    7,912.80x = 35,423,904.67
  5. Step 5: Solve for x
    x = 35,423,904.67/7,912.80
  6. Step 6: Final answer
    x = 4,476.79

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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.