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Finding the Fourth Proportional to 20,634, 28,476 and 12,136.56

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Solution

The fourth proportional to 20,634, 28,476 and 12,136.56 is: 16,749.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,634 : 28,476 = 12,136.56 : x
  2. Step 2: Convert to fraction form
    20,634/28,476 = 12,136.56/x
  3. Step 3: Cross multiply
    20,634x = 28,476 × 12,136.56
  4. Step 4: Simplify right side
    20,634x = 345,600,682.56
  5. Step 5: Solve for x
    x = 345,600,682.56/20,634
  6. Step 6: Final answer
    x = 16,749.09

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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.