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Finding the Fourth Proportional to 18,519.17, 27,780.17 and 7,989.44

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Solution

The fourth proportional to 18,519.17, 27,780.17 and 7,989.44 is: 11,984.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,519.17 : 27,780.17 = 7,989.44 : x
  2. Step 2: Convert to fraction form
    18,519.17/27,780.17 = 7,989.44/x
  3. Step 3: Cross multiply
    18,519.17x = 27,780.17 × 7,989.44
  4. Step 4: Simplify right side
    18,519.17x = 221,947,822.56
  5. Step 5: Solve for x
    x = 221,947,822.56/18,519.17
  6. Step 6: Final answer
    x = 11,984.76

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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.