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Finding the Fourth Proportional to 20,661.45, 28,512.45 and 11,229.99

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Solution

The fourth proportional to 20,661.45, 28,512.45 and 11,229.99 is: 15,497.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.45 : 28,512.45 = 11,229.99 : x
  2. Step 2: Convert to fraction form
    20,661.45/28,512.45 = 11,229.99/x
  3. Step 3: Cross multiply
    20,661.45x = 28,512.45 × 11,229.99
  4. Step 4: Simplify right side
    20,661.45x = 320,194,528.38
  5. Step 5: Solve for x
    x = 320,194,528.38/20,661.45
  6. Step 6: Final answer
    x = 15,497.20

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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.