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Finding the Fourth Proportional to 11,917.28, 17,868.88 and 7,972.88

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Solution

The fourth proportional to 11,917.28, 17,868.88 and 7,972.88 is: 11,954.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,917.28 : 17,868.88 = 7,972.88 : x
  2. Step 2: Convert to fraction form
    11,917.28/17,868.88 = 7,972.88/x
  3. Step 3: Cross multiply
    11,917.28x = 17,868.88 × 7,972.88
  4. Step 4: Simplify right side
    11,917.28x = 142,466,435.97
  5. Step 5: Solve for x
    x = 142,466,435.97/11,917.28
  6. Step 6: Final answer
    x = 11,954.61

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1.5x scale

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.