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Finding the Fourth Proportional to 11,700.80, 16,128.88 and 8,711.88

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Solution

The fourth proportional to 11,700.80, 16,128.88 and 8,711.88 is: 12,008.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,700.80 : 16,128.88 = 8,711.88 : x
  2. Step 2: Convert to fraction form
    11,700.80/16,128.88 = 8,711.88/x
  3. Step 3: Cross multiply
    11,700.80x = 16,128.88 × 8,711.88
  4. Step 4: Simplify right side
    11,700.80x = 140,512,867.09
  5. Step 5: Solve for x
    x = 140,512,867.09/11,700.80
  6. Step 6: Final answer
    x = 12,008.83

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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.