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Finding the Fourth Proportional to 20,480.99, 30,682.12 and 12,560.41

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Solution

The fourth proportional to 20,480.99, 30,682.12 and 12,560.41 is: 18,816.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.99 : 30,682.12 = 12,560.41 : x
  2. Step 2: Convert to fraction form
    20,480.99/30,682.12 = 12,560.41/x
  3. Step 3: Cross multiply
    20,480.99x = 30,682.12 × 12,560.41
  4. Step 4: Simplify right side
    20,480.99x = 385,379,790.66
  5. Step 5: Solve for x
    x = 385,379,790.66/20,480.99
  6. Step 6: Final answer
    x = 18,816.46

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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.