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Finding the Fourth Proportional to 12,128.92, 16,738.92 and 6,824.80

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Solution

The fourth proportional to 12,128.92, 16,738.92 and 6,824.80 is: 9,418.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.92 : 16,738.92 = 6,824.80 : x
  2. Step 2: Convert to fraction form
    12,128.92/16,738.92 = 6,824.80/x
  3. Step 3: Cross multiply
    12,128.92x = 16,738.92 × 6,824.80
  4. Step 4: Simplify right side
    12,128.92x = 114,239,781.22
  5. Step 5: Solve for x
    x = 114,239,781.22/12,128.92
  6. Step 6: Final answer
    x = 9,418.79

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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.