Home / 20,186.80-30,280.20-15,515.80

Finding the Fourth Proportional to 20,186.80, 30,280.20 and 15,515.80

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Solution

The fourth proportional to 20,186.80, 30,280.20 and 15,515.80 is: 23,273.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,186.80 : 30,280.20 = 15,515.80 : x
  2. Step 2: Convert to fraction form
    20,186.80/30,280.20 = 15,515.80/x
  3. Step 3: Cross multiply
    20,186.80x = 30,280.20 × 15,515.80
  4. Step 4: Simplify right side
    20,186.80x = 469,821,527.16
  5. Step 5: Solve for x
    x = 469,821,527.16/20,186.80
  6. Step 6: Final answer
    x = 23,273.70

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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.