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Finding the Fourth Proportional to 20,391.76, 28,142.76 and 11,441.68

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Solution

The fourth proportional to 20,391.76, 28,142.76 and 11,441.68 is: 15,790.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.76 : 28,142.76 = 11,441.68 : x
  2. Step 2: Convert to fraction form
    20,391.76/28,142.76 = 11,441.68/x
  3. Step 3: Cross multiply
    20,391.76x = 28,142.76 × 11,441.68
  4. Step 4: Simplify right side
    20,391.76x = 322,000,454.24
  5. Step 5: Solve for x
    x = 322,000,454.24/20,391.76
  6. Step 6: Final answer
    x = 15,790.71

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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.