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Finding the Fourth Proportional to 13,991.25, 20,986.89 and 4,757.25

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Solution

The fourth proportional to 13,991.25, 20,986.89 and 4,757.25 is: 7,135.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.25 : 20,986.89 = 4,757.25 : x
  2. Step 2: Convert to fraction form
    13,991.25/20,986.89 = 4,757.25/x
  3. Step 3: Cross multiply
    13,991.25x = 20,986.89 × 4,757.25
  4. Step 4: Simplify right side
    13,991.25x = 99,839,882.45
  5. Step 5: Solve for x
    x = 99,839,882.45/13,991.25
  6. Step 6: Final answer
    x = 7,135.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.