Home / 20,775.60-31,163.40-12,481.20

Finding the Fourth Proportional to 20,775.60, 31,163.40 and 12,481.20

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Solution

The fourth proportional to 20,775.60, 31,163.40 and 12,481.20 is: 18,721.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,775.60 : 31,163.40 = 12,481.20 : x
  2. Step 2: Convert to fraction form
    20,775.60/31,163.40 = 12,481.20/x
  3. Step 3: Cross multiply
    20,775.60x = 31,163.40 × 12,481.20
  4. Step 4: Simplify right side
    20,775.60x = 388,956,628.08
  5. Step 5: Solve for x
    x = 388,956,628.08/20,775.60
  6. Step 6: Final answer
    x = 18,721.80

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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.