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Finding the Fourth Proportional to 20,861.92, 28,789.80 and 11,429.86

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Solution

The fourth proportional to 20,861.92, 28,789.80 and 11,429.86 is: 15,773.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.92 : 28,789.80 = 11,429.86 : x
  2. Step 2: Convert to fraction form
    20,861.92/28,789.80 = 11,429.86/x
  3. Step 3: Cross multiply
    20,861.92x = 28,789.80 × 11,429.86
  4. Step 4: Simplify right side
    20,861.92x = 329,063,383.43
  5. Step 5: Solve for x
    x = 329,063,383.43/20,861.92
  6. Step 6: Final answer
    x = 15,773.40

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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.