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Finding the Fourth Proportional to 20,644.77, 28,489.95 and 11,213.40

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Solution

The fourth proportional to 20,644.77, 28,489.95 and 11,213.40 is: 15,474.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.77 : 28,489.95 = 11,213.40 : x
  2. Step 2: Convert to fraction form
    20,644.77/28,489.95 = 11,213.40/x
  3. Step 3: Cross multiply
    20,644.77x = 28,489.95 × 11,213.40
  4. Step 4: Simplify right side
    20,644.77x = 319,469,205.33
  5. Step 5: Solve for x
    x = 319,469,205.33/20,644.77
  6. Step 6: Final answer
    x = 15,474.58

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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.