Home / 20,139.40-30,219.90-8,453.80

Finding the Fourth Proportional to 20,139.40, 30,219.90 and 8,453.80

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Solution

The fourth proportional to 20,139.40, 30,219.90 and 8,453.80 is: 12,685.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.40 : 30,219.90 = 8,453.80 : x
  2. Step 2: Convert to fraction form
    20,139.40/30,219.90 = 8,453.80/x
  3. Step 3: Cross multiply
    20,139.40x = 30,219.90 × 8,453.80
  4. Step 4: Simplify right side
    20,139.40x = 255,472,990.62
  5. Step 5: Solve for x
    x = 255,472,990.62/20,139.40
  6. Step 6: Final answer
    x = 12,685.23

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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.