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Finding the Fourth Proportional to 18,538.53, 27,809.31 and 5,390.88

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Solution

The fourth proportional to 18,538.53, 27,809.31 and 5,390.88 is: 8,086.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,538.53 : 27,809.31 = 5,390.88 : x
  2. Step 2: Convert to fraction form
    18,538.53/27,809.31 = 5,390.88/x
  3. Step 3: Cross multiply
    18,538.53x = 27,809.31 × 5,390.88
  4. Step 4: Simplify right side
    18,538.53x = 149,916,653.09
  5. Step 5: Solve for x
    x = 149,916,653.09/18,538.53
  6. Step 6: Final answer
    x = 8,086.76

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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.