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Finding the Fourth Proportional to 15,201.72, 20,974.68 and 8,912.88

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Solution

The fourth proportional to 15,201.72, 20,974.68 and 8,912.88 is: 12,297.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,201.72 : 20,974.68 = 8,912.88 : x
  2. Step 2: Convert to fraction form
    15,201.72/20,974.68 = 8,912.88/x
  3. Step 3: Cross multiply
    15,201.72x = 20,974.68 × 8,912.88
  4. Step 4: Simplify right side
    15,201.72x = 186,944,805.88
  5. Step 5: Solve for x
    x = 186,944,805.88/15,201.72
  6. Step 6: Final answer
    x = 12,297.61

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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.