Home / 20,979.76-31,469.47-8,499.60

Finding the Fourth Proportional to 20,979.76, 31,469.47 and 8,499.60

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Solution

The fourth proportional to 20,979.76, 31,469.47 and 8,499.60 is: 12,749.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.76 : 31,469.47 = 8,499.60 : x
  2. Step 2: Convert to fraction form
    20,979.76/31,469.47 = 8,499.60/x
  3. Step 3: Cross multiply
    20,979.76x = 31,469.47 × 8,499.60
  4. Step 4: Simplify right side
    20,979.76x = 267,477,907.21
  5. Step 5: Solve for x
    x = 267,477,907.21/20,979.76
  6. Step 6: Final answer
    x = 12,749.33

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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.