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Finding the Fourth Proportional to 15,213.92, 20,992.64 and 8,499.60

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Solution

The fourth proportional to 15,213.92, 20,992.64 and 8,499.60 is: 11,728.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,213.92 : 20,992.64 = 8,499.60 : x
  2. Step 2: Convert to fraction form
    15,213.92/20,992.64 = 8,499.60/x
  3. Step 3: Cross multiply
    15,213.92x = 20,992.64 × 8,499.60
  4. Step 4: Simplify right side
    15,213.92x = 178,429,042.94
  5. Step 5: Solve for x
    x = 178,429,042.94/15,213.92
  6. Step 6: Final answer
    x = 11,728.01

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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.