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Finding the Fourth Proportional to 20,800.32, 31,190.40 and 10,406.40

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Solution

The fourth proportional to 20,800.32, 31,190.40 and 10,406.40 is: 15,604.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.32 : 31,190.40 = 10,406.40 : x
  2. Step 2: Convert to fraction form
    20,800.32/31,190.40 = 10,406.40/x
  3. Step 3: Cross multiply
    20,800.32x = 31,190.40 × 10,406.40
  4. Step 4: Simplify right side
    20,800.32x = 324,579,778.56
  5. Step 5: Solve for x
    x = 324,579,778.56/20,800.32
  6. Step 6: Final answer
    x = 15,604.56

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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.