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Finding the Fourth Proportional to 20,660.79, 30,991.53 and 10,819.29

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Solution

The fourth proportional to 20,660.79, 30,991.53 and 10,819.29 is: 16,229.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.79 : 30,991.53 = 10,819.29 : x
  2. Step 2: Convert to fraction form
    20,660.79/30,991.53 = 10,819.29/x
  3. Step 3: Cross multiply
    20,660.79x = 30,991.53 × 10,819.29
  4. Step 4: Simplify right side
    20,660.79x = 335,306,350.61
  5. Step 5: Solve for x
    x = 335,306,350.61/20,660.79
  6. Step 6: Final answer
    x = 16,229.12

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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.