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Finding the Fourth Proportional to 20,812.63, 31,218.97 and 8,500.63

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Solution

The fourth proportional to 20,812.63, 31,218.97 and 8,500.63 is: 12,750.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.63 : 31,218.97 = 8,500.63 : x
  2. Step 2: Convert to fraction form
    20,812.63/31,218.97 = 8,500.63/x
  3. Step 3: Cross multiply
    20,812.63x = 31,218.97 × 8,500.63
  4. Step 4: Simplify right side
    20,812.63x = 265,380,756.86
  5. Step 5: Solve for x
    x = 265,380,756.86/20,812.63
  6. Step 6: Final answer
    x = 12,750.95

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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.