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Finding the Fourth Proportional to 15,990.86, 22,067.79 and 8,917.22

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Solution

The fourth proportional to 15,990.86, 22,067.79 and 8,917.22 is: 12,305.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,990.86 : 22,067.79 = 8,917.22 : x
  2. Step 2: Convert to fraction form
    15,990.86/22,067.79 = 8,917.22/x
  3. Step 3: Cross multiply
    15,990.86x = 22,067.79 × 8,917.22
  4. Step 4: Simplify right side
    15,990.86x = 196,783,338.34
  5. Step 5: Solve for x
    x = 196,783,338.34/15,990.86
  6. Step 6: Final answer
    x = 12,305.99

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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.