Home / 13,428.38-20,139.53-5,105.43

Finding the Fourth Proportional to 13,428.38, 20,139.53 and 5,105.43

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Solution

The fourth proportional to 13,428.38, 20,139.53 and 5,105.43 is: 7,656.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,428.38 : 20,139.53 = 5,105.43 : x
  2. Step 2: Convert to fraction form
    13,428.38/20,139.53 = 5,105.43/x
  3. Step 3: Cross multiply
    13,428.38x = 20,139.53 × 5,105.43
  4. Step 4: Simplify right side
    13,428.38x = 102,820,960.65
  5. Step 5: Solve for x
    x = 102,820,960.65/13,428.38
  6. Step 6: Final answer
    x = 7,656.99

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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.