Home / 20,515.20-30,768.60-5,720.40

Finding the Fourth Proportional to 20,515.20, 30,768.60 and 5,720.40

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Solution

The fourth proportional to 20,515.20, 30,768.60 and 5,720.40 is: 8,579.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.20 : 30,768.60 = 5,720.40 : x
  2. Step 2: Convert to fraction form
    20,515.20/30,768.60 = 5,720.40/x
  3. Step 3: Cross multiply
    20,515.20x = 30,768.60 × 5,720.40
  4. Step 4: Simplify right side
    20,515.20x = 176,008,699.44
  5. Step 5: Solve for x
    x = 176,008,699.44/20,515.20
  6. Step 6: Final answer
    x = 8,579.43

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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.