Home / 20,942.60-31,410.30-7,788.20

Finding the Fourth Proportional to 20,942.60, 31,410.30 and 7,788.20

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Solution

The fourth proportional to 20,942.60, 31,410.30 and 7,788.20 is: 11,680.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,942.60 : 31,410.30 = 7,788.20 : x
  2. Step 2: Convert to fraction form
    20,942.60/31,410.30 = 7,788.20/x
  3. Step 3: Cross multiply
    20,942.60x = 31,410.30 × 7,788.20
  4. Step 4: Simplify right side
    20,942.60x = 244,629,698.46
  5. Step 5: Solve for x
    x = 244,629,698.46/20,942.60
  6. Step 6: Final answer
    x = 11,680.96

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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.