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Finding the Fourth Proportional to 8,653.38, 12,979.98 and 2,809.86

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Solution

The fourth proportional to 8,653.38, 12,979.98 and 2,809.86 is: 4,214.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,653.38 : 12,979.98 = 2,809.86 : x
  2. Step 2: Convert to fraction form
    8,653.38/12,979.98 = 2,809.86/x
  3. Step 3: Cross multiply
    8,653.38x = 12,979.98 × 2,809.86
  4. Step 4: Simplify right side
    8,653.38x = 36,471,926.60
  5. Step 5: Solve for x
    x = 36,471,926.60/8,653.38
  6. Step 6: Final answer
    x = 4,214.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.