Home / 20,469.60-30,722.40-12,139.20

Finding the Fourth Proportional to 20,469.60, 30,722.40 and 12,139.20

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Solution

The fourth proportional to 20,469.60, 30,722.40 and 12,139.20 is: 18,219.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,469.60 : 30,722.40 = 12,139.20 : x
  2. Step 2: Convert to fraction form
    20,469.60/30,722.40 = 12,139.20/x
  3. Step 3: Cross multiply
    20,469.60x = 30,722.40 × 12,139.20
  4. Step 4: Simplify right side
    20,469.60x = 372,945,358.08
  5. Step 5: Solve for x
    x = 372,945,358.08/20,469.60
  6. Step 6: Final answer
    x = 18,219.47

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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.