Home / 20,979.70-31,469.63-8,499.96

Finding the Fourth Proportional to 20,979.70, 31,469.63 and 8,499.96

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Solution

The fourth proportional to 20,979.70, 31,469.63 and 8,499.96 is: 12,749.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.70 : 31,469.63 = 8,499.96 : x
  2. Step 2: Convert to fraction form
    20,979.70/31,469.63 = 8,499.96/x
  3. Step 3: Cross multiply
    20,979.70x = 31,469.63 × 8,499.96
  4. Step 4: Simplify right side
    20,979.70x = 267,490,596.21
  5. Step 5: Solve for x
    x = 267,490,596.21/20,979.70
  6. Step 6: Final answer
    x = 12,749.97

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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.