Home / 20,615.28-28,449-11,183.60

Finding the Fourth Proportional to 20,615.28, 28,449 and 11,183.60

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Solution

The fourth proportional to 20,615.28, 28,449 and 11,183.60 is: 15,433.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,615.28 : 28,449 = 11,183.60 : x
  2. Step 2: Convert to fraction form
    20,615.28/28,449 = 11,183.60/x
  3. Step 3: Cross multiply
    20,615.28x = 28,449 × 11,183.60
  4. Step 4: Simplify right side
    20,615.28x = 318,162,236.40
  5. Step 5: Solve for x
    x = 318,162,236.40/20,615.28
  6. Step 6: Final answer
    x = 15,433.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.