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Finding the Fourth Proportional to 18,489.40, 27,729.99 and 5,338.90

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Solution

The fourth proportional to 18,489.40, 27,729.99 and 5,338.90 is: 8,007.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489.40 : 27,729.99 = 5,338.90 : x
  2. Step 2: Convert to fraction form
    18,489.40/27,729.99 = 5,338.90/x
  3. Step 3: Cross multiply
    18,489.40x = 27,729.99 × 5,338.90
  4. Step 4: Simplify right side
    18,489.40x = 148,047,643.61
  5. Step 5: Solve for x
    x = 148,047,643.61/18,489.40
  6. Step 6: Final answer
    x = 8,007.16

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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.