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Finding the Fourth Proportional to 13,621.22, 20,442.87 and 7,049.29

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Solution

The fourth proportional to 13,621.22, 20,442.87 and 7,049.29 is: 10,579.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,621.22 : 20,442.87 = 7,049.29 : x
  2. Step 2: Convert to fraction form
    13,621.22/20,442.87 = 7,049.29/x
  3. Step 3: Cross multiply
    13,621.22x = 20,442.87 × 7,049.29
  4. Step 4: Simplify right side
    13,621.22x = 144,107,667.96
  5. Step 5: Solve for x
    x = 144,107,667.96/13,621.22
  6. Step 6: Final answer
    x = 10,579.64

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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.