Home / 20,811.28-28,729.20-12,310.72

Finding the Fourth Proportional to 20,811.28, 28,729.20 and 12,310.72

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Solution

The fourth proportional to 20,811.28, 28,729.20 and 12,310.72 is: 16,994.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.28 : 28,729.20 = 12,310.72 : x
  2. Step 2: Convert to fraction form
    20,811.28/28,729.20 = 12,310.72/x
  3. Step 3: Cross multiply
    20,811.28x = 28,729.20 × 12,310.72
  4. Step 4: Simplify right side
    20,811.28x = 353,677,137.02
  5. Step 5: Solve for x
    x = 353,677,137.02/20,811.28
  6. Step 6: Final answer
    x = 16,994.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.