Home / 20,939.22-31,396.68-8,449.02

Finding the Fourth Proportional to 20,939.22, 31,396.68 and 8,449.02

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Solution

The fourth proportional to 20,939.22, 31,396.68 and 8,449.02 is: 12,668.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.22 : 31,396.68 = 8,449.02 : x
  2. Step 2: Convert to fraction form
    20,939.22/31,396.68 = 8,449.02/x
  3. Step 3: Cross multiply
    20,939.22x = 31,396.68 × 8,449.02
  4. Step 4: Simplify right side
    20,939.22x = 265,271,177.25
  5. Step 5: Solve for x
    x = 265,271,177.25/20,939.22
  6. Step 6: Final answer
    x = 12,668.63

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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.