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Finding the Fourth Proportional to 13,889.28, 20,865.28 and 8,060.16

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Solution

The fourth proportional to 13,889.28, 20,865.28 and 8,060.16 is: 12,108.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.28 : 20,865.28 = 8,060.16 : x
  2. Step 2: Convert to fraction form
    13,889.28/20,865.28 = 8,060.16/x
  3. Step 3: Cross multiply
    13,889.28x = 20,865.28 × 8,060.16
  4. Step 4: Simplify right side
    13,889.28x = 168,177,495.24
  5. Step 5: Solve for x
    x = 168,177,495.24/13,889.28
  6. Step 6: Final answer
    x = 12,108.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.