Home / 20,638.60-30,942.30-10,257.64

Finding the Fourth Proportional to 20,638.60, 30,942.30 and 10,257.64

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Solution

The fourth proportional to 20,638.60, 30,942.30 and 10,257.64 is: 15,378.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.60 : 30,942.30 = 10,257.64 : x
  2. Step 2: Convert to fraction form
    20,638.60/30,942.30 = 10,257.64/x
  3. Step 3: Cross multiply
    20,638.60x = 30,942.30 × 10,257.64
  4. Step 4: Simplify right side
    20,638.60x = 317,394,974.17
  5. Step 5: Solve for x
    x = 317,394,974.17/20,638.60
  6. Step 6: Final answer
    x = 15,378.71

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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.