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Finding the Fourth Proportional to 18,745.29, 28,128.87 and 13,474.62

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Solution

The fourth proportional to 18,745.29, 28,128.87 and 13,474.62 is: 20,219.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.29 : 28,128.87 = 13,474.62 : x
  2. Step 2: Convert to fraction form
    18,745.29/28,128.87 = 13,474.62/x
  3. Step 3: Cross multiply
    18,745.29x = 28,128.87 × 13,474.62
  4. Step 4: Simplify right side
    18,745.29x = 379,025,834.28
  5. Step 5: Solve for x
    x = 379,025,834.28/18,745.29
  6. Step 6: Final answer
    x = 20,219.79

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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.