Home / 20,309.20-30,447.60-8,612.80

Finding the Fourth Proportional to 20,309.20, 30,447.60 and 8,612.80

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Solution

The fourth proportional to 20,309.20, 30,447.60 and 8,612.80 is: 12,912.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,309.20 : 30,447.60 = 8,612.80 : x
  2. Step 2: Convert to fraction form
    20,309.20/30,447.60 = 8,612.80/x
  3. Step 3: Cross multiply
    20,309.20x = 30,447.60 × 8,612.80
  4. Step 4: Simplify right side
    20,309.20x = 262,239,089.28
  5. Step 5: Solve for x
    x = 262,239,089.28/20,309.20
  6. Step 6: Final answer
    x = 12,912.33

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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.