Home / 20,475.20-30,708.60-5,680.40

Finding the Fourth Proportional to 20,475.20, 30,708.60 and 5,680.40

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Solution

The fourth proportional to 20,475.20, 30,708.60 and 5,680.40 is: 8,519.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,475.20 : 30,708.60 = 5,680.40 : x
  2. Step 2: Convert to fraction form
    20,475.20/30,708.60 = 5,680.40/x
  3. Step 3: Cross multiply
    20,475.20x = 30,708.60 × 5,680.40
  4. Step 4: Simplify right side
    20,475.20x = 174,437,131.44
  5. Step 5: Solve for x
    x = 174,437,131.44/20,475.20
  6. Step 6: Final answer
    x = 8,519.43

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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.