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Finding the Fourth Proportional to 13,771, 20,639.22 and 7,109.56

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Solution

The fourth proportional to 13,771, 20,639.22 and 7,109.56 is: 10,655.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,771 : 20,639.22 = 7,109.56 : x
  2. Step 2: Convert to fraction form
    13,771/20,639.22 = 7,109.56/x
  3. Step 3: Cross multiply
    13,771x = 20,639.22 × 7,109.56
  4. Step 4: Simplify right side
    13,771x = 146,735,772.94
  5. Step 5: Solve for x
    x = 146,735,772.94/13,771
  6. Step 6: Final answer
    x = 10,655.42

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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.