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Finding the Fourth Proportional to 20,990.85, 28,969.41 and 15,676.44

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Solution

The fourth proportional to 20,990.85, 28,969.41 and 15,676.44 is: 21,635.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.85 : 28,969.41 = 15,676.44 : x
  2. Step 2: Convert to fraction form
    20,990.85/28,969.41 = 15,676.44/x
  3. Step 3: Cross multiply
    20,990.85x = 28,969.41 × 15,676.44
  4. Step 4: Simplify right side
    20,990.85x = 454,137,167.85
  5. Step 5: Solve for x
    x = 454,137,167.85/20,990.85
  6. Step 6: Final answer
    x = 21,635.01

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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.