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Finding the Fourth Proportional to 13,994.42, 20,991.63 and 13,139.06

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Solution

The fourth proportional to 13,994.42, 20,991.63 and 13,139.06 is: 19,708.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,994.42 : 20,991.63 = 13,139.06 : x
  2. Step 2: Convert to fraction form
    13,994.42/20,991.63 = 13,139.06/x
  3. Step 3: Cross multiply
    13,994.42x = 20,991.63 × 13,139.06
  4. Step 4: Simplify right side
    13,994.42x = 275,810,286.07
  5. Step 5: Solve for x
    x = 275,810,286.07/13,994.42
  6. Step 6: Final answer
    x = 19,708.59

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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.