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Finding the Fourth Proportional to 18,833.40, 28,239 and 7,147.44

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Solution

The fourth proportional to 18,833.40, 28,239 and 7,147.44 is: 10,716.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,833.40 : 28,239 = 7,147.44 : x
  2. Step 2: Convert to fraction form
    18,833.40/28,239 = 7,147.44/x
  3. Step 3: Cross multiply
    18,833.40x = 28,239 × 7,147.44
  4. Step 4: Simplify right side
    18,833.40x = 201,836,558.16
  5. Step 5: Solve for x
    x = 201,836,558.16/18,833.40
  6. Step 6: Final answer
    x = 10,716.95

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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.