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Finding the Fourth Proportional to 20,369.76, 28,107.81 and 11,415.21

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Solution

The fourth proportional to 20,369.76, 28,107.81 and 11,415.21 is: 15,751.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,369.76 : 28,107.81 = 11,415.21 : x
  2. Step 2: Convert to fraction form
    20,369.76/28,107.81 = 11,415.21/x
  3. Step 3: Cross multiply
    20,369.76x = 28,107.81 × 11,415.21
  4. Step 4: Simplify right side
    20,369.76x = 320,856,553.79
  5. Step 5: Solve for x
    x = 320,856,553.79/20,369.76
  6. Step 6: Final answer
    x = 15,751.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.