Home / 20,942.16-28,900.20-11,511.20

Finding the Fourth Proportional to 20,942.16, 28,900.20 and 11,511.20

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Solution

The fourth proportional to 20,942.16, 28,900.20 and 11,511.20 is: 15,885.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.16 : 28,900.20 = 11,511.20 : x
  2. Step 2: Convert to fraction form
    20,942.16/28,900.20 = 11,511.20/x
  3. Step 3: Cross multiply
    20,942.16x = 28,900.20 × 11,511.20
  4. Step 4: Simplify right side
    20,942.16x = 332,675,982.24
  5. Step 5: Solve for x
    x = 332,675,982.24/20,942.16
  6. Step 6: Final answer
    x = 15,885.47

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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.