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Finding the Fourth Proportional to 18,720.70, 28,044.60 and 12,815.80

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Solution

The fourth proportional to 18,720.70, 28,044.60 and 12,815.80 is: 19,198.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.70 : 28,044.60 = 12,815.80 : x
  2. Step 2: Convert to fraction form
    18,720.70/28,044.60 = 12,815.80/x
  3. Step 3: Cross multiply
    18,720.70x = 28,044.60 × 12,815.80
  4. Step 4: Simplify right side
    18,720.70x = 359,413,984.68
  5. Step 5: Solve for x
    x = 359,413,984.68/18,720.70
  6. Step 6: Final answer
    x = 19,198.75

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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.