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Finding the Fourth Proportional to 12,149.75, 16,769.79 and 7,911.40

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Solution

The fourth proportional to 12,149.75, 16,769.79 and 7,911.40 is: 10,919.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,149.75 : 16,769.79 = 7,911.40 : x
  2. Step 2: Convert to fraction form
    12,149.75/16,769.79 = 7,911.40/x
  3. Step 3: Cross multiply
    12,149.75x = 16,769.79 × 7,911.40
  4. Step 4: Simplify right side
    12,149.75x = 132,672,474.68
  5. Step 5: Solve for x
    x = 132,672,474.68/12,149.75
  6. Step 6: Final answer
    x = 10,919.77

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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.