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Finding the Fourth Proportional to 20,561.79, 28,375.03 and 11,609.67

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Solution

The fourth proportional to 20,561.79, 28,375.03 and 11,609.67 is: 16,021.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.79 : 28,375.03 = 11,609.67 : x
  2. Step 2: Convert to fraction form
    20,561.79/28,375.03 = 11,609.67/x
  3. Step 3: Cross multiply
    20,561.79x = 28,375.03 × 11,609.67
  4. Step 4: Simplify right side
    20,561.79x = 329,424,734.54
  5. Step 5: Solve for x
    x = 329,424,734.54/20,561.79
  6. Step 6: Final answer
    x = 16,021.21

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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.