Home / 20,742.87-28,625.10-11,311.43

Finding the Fourth Proportional to 20,742.87, 28,625.10 and 11,311.43

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Solution

The fourth proportional to 20,742.87, 28,625.10 and 11,311.43 is: 15,609.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.87 : 28,625.10 = 11,311.43 : x
  2. Step 2: Convert to fraction form
    20,742.87/28,625.10 = 11,311.43/x
  3. Step 3: Cross multiply
    20,742.87x = 28,625.10 × 11,311.43
  4. Step 4: Simplify right side
    20,742.87x = 323,790,814.89
  5. Step 5: Solve for x
    x = 323,790,814.89/20,742.87
  6. Step 6: Final answer
    x = 15,609.74

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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.