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Finding the Fourth Proportional to 18,760.23, 28,109.11 and 13,201.90

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Solution

The fourth proportional to 18,760.23, 28,109.11 and 13,201.90 is: 19,780.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,760.23 : 28,109.11 = 13,201.90 : x
  2. Step 2: Convert to fraction form
    18,760.23/28,109.11 = 13,201.90/x
  3. Step 3: Cross multiply
    18,760.23x = 28,109.11 × 13,201.90
  4. Step 4: Simplify right side
    18,760.23x = 371,093,556.03
  5. Step 5: Solve for x
    x = 371,093,556.03/18,760.23
  6. Step 6: Final answer
    x = 19,780.86

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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.