Home / 18,520.17-27,781.67-7,990.44

Finding the Fourth Proportional to 18,520.17, 27,781.67 and 7,990.44

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Solution

The fourth proportional to 18,520.17, 27,781.67 and 7,990.44 is: 11,986.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,520.17 : 27,781.67 = 7,990.44 : x
  2. Step 2: Convert to fraction form
    18,520.17/27,781.67 = 7,990.44/x
  3. Step 3: Cross multiply
    18,520.17x = 27,781.67 × 7,990.44
  4. Step 4: Simplify right side
    18,520.17x = 221,987,767.23
  5. Step 5: Solve for x
    x = 221,987,767.23/18,520.17
  6. Step 6: Final answer
    x = 11,986.27

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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.