Home / 20,518.80-30,778.20-18,769.20

Finding the Fourth Proportional to 20,518.80, 30,778.20 and 18,769.20

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Solution

The fourth proportional to 20,518.80, 30,778.20 and 18,769.20 is: 28,153.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.80 : 30,778.20 = 18,769.20 : x
  2. Step 2: Convert to fraction form
    20,518.80/30,778.20 = 18,769.20/x
  3. Step 3: Cross multiply
    20,518.80x = 30,778.20 × 18,769.20
  4. Step 4: Simplify right side
    20,518.80x = 577,682,191.44
  5. Step 5: Solve for x
    x = 577,682,191.44/20,518.80
  6. Step 6: Final answer
    x = 28,153.80

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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.