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Finding the Fourth Proportional to 13,605.98, 20,399.31 and 5,278.97

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Solution

The fourth proportional to 13,605.98, 20,399.31 and 5,278.97 is: 7,914.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,605.98 : 20,399.31 = 5,278.97 : x
  2. Step 2: Convert to fraction form
    13,605.98/20,399.31 = 5,278.97/x
  3. Step 3: Cross multiply
    13,605.98x = 20,399.31 × 5,278.97
  4. Step 4: Simplify right side
    13,605.98x = 107,687,396.51
  5. Step 5: Solve for x
    x = 107,687,396.51/13,605.98
  6. Step 6: Final answer
    x = 7,914.71

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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.