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Finding the Fourth Proportional to 19,763.92, 27,289.92 and 12,221.20

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Solution

The fourth proportional to 19,763.92, 27,289.92 and 12,221.20 is: 16,874.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,763.92 : 27,289.92 = 12,221.20 : x
  2. Step 2: Convert to fraction form
    19,763.92/27,289.92 = 12,221.20/x
  3. Step 3: Cross multiply
    19,763.92x = 27,289.92 × 12,221.20
  4. Step 4: Simplify right side
    19,763.92x = 333,515,570.30
  5. Step 5: Solve for x
    x = 333,515,570.30/19,763.92
  6. Step 6: Final answer
    x = 16,874.97

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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.