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Finding the Fourth Proportional to 20,666.67, 30,999.33 and 8,979.90

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Solution

The fourth proportional to 20,666.67, 30,999.33 and 8,979.90 is: 13,469.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.67 : 30,999.33 = 8,979.90 : x
  2. Step 2: Convert to fraction form
    20,666.67/30,999.33 = 8,979.90/x
  3. Step 3: Cross multiply
    20,666.67x = 30,999.33 × 8,979.90
  4. Step 4: Simplify right side
    20,666.67x = 278,370,883.47
  5. Step 5: Solve for x
    x = 278,370,883.47/20,666.67
  6. Step 6: Final answer
    x = 13,469.56

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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.