Home / 20,621.28-28,456.61-11,189.64

Finding the Fourth Proportional to 20,621.28, 28,456.61 and 11,189.64

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Solution

The fourth proportional to 20,621.28, 28,456.61 and 11,189.64 is: 15,441.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.28 : 28,456.61 = 11,189.64 : x
  2. Step 2: Convert to fraction form
    20,621.28/28,456.61 = 11,189.64/x
  3. Step 3: Cross multiply
    20,621.28x = 28,456.61 × 11,189.64
  4. Step 4: Simplify right side
    20,621.28x = 318,419,165.57
  5. Step 5: Solve for x
    x = 318,419,165.57/20,621.28
  6. Step 6: Final answer
    x = 15,441.29

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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.