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Finding the Fourth Proportional to 20,813.92, 28,722.92 and 11,861.96

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Solution

The fourth proportional to 20,813.92, 28,722.92 and 11,861.96 is: 16,369.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,813.92 : 28,722.92 = 11,861.96 : x
  2. Step 2: Convert to fraction form
    20,813.92/28,722.92 = 11,861.96/x
  3. Step 3: Cross multiply
    20,813.92x = 28,722.92 × 11,861.96
  4. Step 4: Simplify right side
    20,813.92x = 340,710,128.12
  5. Step 5: Solve for x
    x = 340,710,128.12/20,813.92
  6. Step 6: Final answer
    x = 16,369.34

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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.