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Finding the Fourth Proportional to 18,525.88, 27,780.41 and 7,990.92

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Solution

The fourth proportional to 18,525.88, 27,780.41 and 7,990.92 is: 11,982.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,525.88 : 27,780.41 = 7,990.92 : x
  2. Step 2: Convert to fraction form
    18,525.88/27,780.41 = 7,990.92/x
  3. Step 3: Cross multiply
    18,525.88x = 27,780.41 × 7,990.92
  4. Step 4: Simplify right side
    18,525.88x = 221,991,033.88
  5. Step 5: Solve for x
    x = 221,991,033.88/18,525.88
  6. Step 6: Final answer
    x = 11,982.75

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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.