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Finding the Fourth Proportional to 11,694.70, 16,143.75 and 7,928.79

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Solution

The fourth proportional to 11,694.70, 16,143.75 and 7,928.79 is: 10,945.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,694.70 : 16,143.75 = 7,928.79 : x
  2. Step 2: Convert to fraction form
    11,694.70/16,143.75 = 7,928.79/x
  3. Step 3: Cross multiply
    11,694.70x = 16,143.75 × 7,928.79
  4. Step 4: Simplify right side
    11,694.70x = 128,000,403.56
  5. Step 5: Solve for x
    x = 128,000,403.56/11,694.70
  6. Step 6: Final answer
    x = 10,945.16

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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.