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Finding the Fourth Proportional to 20,991.88, 28,968.37 and 11,431.88

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Solution

The fourth proportional to 20,991.88, 28,968.37 and 11,431.88 is: 15,775.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.88 : 28,968.37 = 11,431.88 : x
  2. Step 2: Convert to fraction form
    20,991.88/28,968.37 = 11,431.88/x
  3. Step 3: Cross multiply
    20,991.88x = 28,968.37 × 11,431.88
  4. Step 4: Simplify right side
    20,991.88x = 331,162,929.64
  5. Step 5: Solve for x
    x = 331,162,929.64/20,991.88
  6. Step 6: Final answer
    x = 15,775.76

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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.