Home / 20,979.42-31,469.21-8,499.68

Finding the Fourth Proportional to 20,979.42, 31,469.21 and 8,499.68

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Solution

The fourth proportional to 20,979.42, 31,469.21 and 8,499.68 is: 12,749.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.42 : 31,469.21 = 8,499.68 : x
  2. Step 2: Convert to fraction form
    20,979.42/31,469.21 = 8,499.68/x
  3. Step 3: Cross multiply
    20,979.42x = 31,469.21 × 8,499.68
  4. Step 4: Simplify right side
    20,979.42x = 267,478,214.85
  5. Step 5: Solve for x
    x = 267,478,214.85/20,979.42
  6. Step 6: Final answer
    x = 12,749.55

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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.