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Finding the Fourth Proportional to 15,940.86, 21,996.24 and 8,865.92

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Solution

The fourth proportional to 15,940.86, 21,996.24 and 8,865.92 is: 12,233.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,940.86 : 21,996.24 = 8,865.92 : x
  2. Step 2: Convert to fraction form
    15,940.86/21,996.24 = 8,865.92/x
  3. Step 3: Cross multiply
    15,940.86x = 21,996.24 × 8,865.92
  4. Step 4: Simplify right side
    15,940.86x = 195,016,904.14
  5. Step 5: Solve for x
    x = 195,016,904.14/15,940.86
  6. Step 6: Final answer
    x = 12,233.78

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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.