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Finding the Fourth Proportional to 13,991.80, 20,987.88 and 4,131.22

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Solution

The fourth proportional to 13,991.80, 20,987.88 and 4,131.22 is: 6,196.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.80 : 20,987.88 = 4,131.22 : x
  2. Step 2: Convert to fraction form
    13,991.80/20,987.88 = 4,131.22/x
  3. Step 3: Cross multiply
    13,991.80x = 20,987.88 × 4,131.22
  4. Step 4: Simplify right side
    13,991.80x = 86,705,549.61
  5. Step 5: Solve for x
    x = 86,705,549.61/13,991.80
  6. Step 6: Final answer
    x = 6,196.88

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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.