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Finding the Fourth Proportional to 20,644.60, 28,489.08 and 11,212.96

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Solution

The fourth proportional to 20,644.60, 28,489.08 and 11,212.96 is: 15,473.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.60 : 28,489.08 = 11,212.96 : x
  2. Step 2: Convert to fraction form
    20,644.60/28,489.08 = 11,212.96/x
  3. Step 3: Cross multiply
    20,644.60x = 28,489.08 × 11,212.96
  4. Step 4: Simplify right side
    20,644.60x = 319,446,914.48
  5. Step 5: Solve for x
    x = 319,446,914.48/20,644.60
  6. Step 6: Final answer
    x = 15,473.63

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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.