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Finding the Fourth Proportional to 20,908.69, 28,854.02 and 11,956.39

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Solution

The fourth proportional to 20,908.69, 28,854.02 and 11,956.39 is: 16,499.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.69 : 28,854.02 = 11,956.39 : x
  2. Step 2: Convert to fraction form
    20,908.69/28,854.02 = 11,956.39/x
  3. Step 3: Cross multiply
    20,908.69x = 28,854.02 × 11,956.39
  4. Step 4: Simplify right side
    20,908.69x = 344,989,873.94
  5. Step 5: Solve for x
    x = 344,989,873.94/20,908.69
  6. Step 6: Final answer
    x = 16,499.83

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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.