Home / 20,689.89-28,548.26-13,517.90

Finding the Fourth Proportional to 20,689.89, 28,548.26 and 13,517.90

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Solution

The fourth proportional to 20,689.89, 28,548.26 and 13,517.90 is: 18,652.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.89 : 28,548.26 = 13,517.90 : x
  2. Step 2: Convert to fraction form
    20,689.89/28,548.26 = 13,517.90/x
  3. Step 3: Cross multiply
    20,689.89x = 28,548.26 × 13,517.90
  4. Step 4: Simplify right side
    20,689.89x = 385,912,523.85
  5. Step 5: Solve for x
    x = 385,912,523.85/20,689.89
  6. Step 6: Final answer
    x = 18,652.23

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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.