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Finding the Fourth Proportional to 13,991.64, 20,987.06 and 6,591.88

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Solution

The fourth proportional to 13,991.64, 20,987.06 and 6,591.88 is: 9,887.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.64 : 20,987.06 = 6,591.88 : x
  2. Step 2: Convert to fraction form
    13,991.64/20,987.06 = 6,591.88/x
  3. Step 3: Cross multiply
    13,991.64x = 20,987.06 × 6,591.88
  4. Step 4: Simplify right side
    13,991.64x = 138,344,181.07
  5. Step 5: Solve for x
    x = 138,344,181.07/13,991.64
  6. Step 6: Final answer
    x = 9,887.63

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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.