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Finding the Fourth Proportional to 18,659.21, 27,989.08 and 6,660.88

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Solution

The fourth proportional to 18,659.21, 27,989.08 and 6,660.88 is: 9,991.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.21 : 27,989.08 = 6,660.88 : x
  2. Step 2: Convert to fraction form
    18,659.21/27,989.08 = 6,660.88/x
  3. Step 3: Cross multiply
    18,659.21x = 27,989.08 × 6,660.88
  4. Step 4: Simplify right side
    18,659.21x = 186,431,816.57
  5. Step 5: Solve for x
    x = 186,431,816.57/18,659.21
  6. Step 6: Final answer
    x = 9,991.41

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Double scale
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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.