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Finding the Fourth Proportional to 20,660.62, 28,511.64 and 12,163

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Solution

The fourth proportional to 20,660.62, 28,511.64 and 12,163 is: 16,784.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.62 : 28,511.64 = 12,163 : x
  2. Step 2: Convert to fraction form
    20,660.62/28,511.64 = 12,163/x
  3. Step 3: Cross multiply
    20,660.62x = 28,511.64 × 12,163
  4. Step 4: Simplify right side
    20,660.62x = 346,787,077.32
  5. Step 5: Solve for x
    x = 346,787,077.32/20,660.62
  6. Step 6: Final answer
    x = 16,784.93

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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.